At this moment I think it's 50 or 60% in the very end (not sure though) and yes it would be a progressive tax indeed, just like any other tax law (for example I pay taxes in ireland and there are several progressive tax levels. it's 40% over something like 2600e/month). So under 1M there is a 40ish% of taxation, and any euro earned over 1M would be taxed to 75%. But I don't think it's gonna happen for real, it looks like an improvisation by Holland to get free advertisement, many of his close specialists were surprised themselves he said that on television a month ago. This is called ISF here, Impot sur la Fortune, and this new level would only affect 10000 persons or something like that. I don't think it's applicable on companies though, its very name implies its on fortune, which is different, it's personal enrichment. But, indeed, many fear that because some individuals are threatened by bigger tax whatever the actual %age will be, they will wanna leave the contry at least from a legal point of view, and since obviously most of those people own or lead companies, it could have an effect on those as a result. Turns out in the past (with the different tax systems we have had over the century) this effect was not as strong as people claim it could be.
EDIT: found the number : it's 59% in the end for someone who would earn 2M because of the several "slices" of taxation. If you add the values for each slice (the money representing that slice multiplied by that slice's tax percentage), one after the other, the last one being 75% on the top 1M, you end up with a 59% tax on a 2M income. The difference compared to the actual system is 18%, with the same calculation.
The thing is that this is ONE taxation, there are many other ones that are designed for high incomes. There are also a lot of legal ways to avoid paying taxes as much, so in the end in the actual world people pay all in all way less taxes than that. Even more surprising, the highest incomes pay less in % than an average salary. Starting from a certain value, the %age of overall tax is not 40ish anymore but 30ish, with only legal means, so imagine with illegal ones (like abusing buying art objects which are not taxed, stuff like that)
There are other laws that would limit the max %age you are taxed if I'm right, which existed before under other presidents, which limit the overall value of the addition of all taxes one can be entitled to pay, as an insurance you are gonna earn a minimum %age of your money. Sarkozy wanted that maximum level of tax to be 50% (which means that whatever happens tax wise, you cannot be taxed to more than 50%) and I think he removed it because it was judged unfair by lowest incomes, and hollands wants it to be higher than that, as well, to limit fiscal evasion.
There are many articles (in french though) which explains more the actual logics of french taxation over high incomes, it's more complicated than just "they are gonna pay half more than what they do at the moment", eventhough in any case yeah high incomes will pay just more. It is not expected to make a big difference because they are so few.
It's of course taken out of context. Hollande said he actually wants to make this applicable, so we shall see how it turns out to be. Most people are in doubt here and think this was just a move to please the people and get votes because it only concerns...3000 persons, so making 3000ppl angry is worth the millions others ! But I don't think he would have said such a thing knowing it will only make people flee from the country and therefore have a negative impact on our economy. At least, I hope ! But I read some analysts said that in the past, other decisions made by sarkozy (including taxing at 75% the "golden parachute" retirement some companies pay to their ex CEO) that were supposed to make people flee, didn't. In the same vein, the limit of 50% of taxation sarkozy made which was a progress for high incomes (because before that they would pay a higher amount all included) didn't make people come back to france either. It turns out this kind of decisions are not enough to indue such an effect in real life, or the very few individuals that do don't have an impact on a large scale.
In any case, he has not the full power to pass such a law, it has to be approved, and cannot be approved if it is judged "confiscatoire" (confiscatory ?) which more or less means it wouldn't pass if it's judged unfair and counter productive.
Another important thing to mention about upcoming taxes, is that I think I heard mentioned the fact than for this taxation, you wouldn't be able to flee the country, because as long as you are french, you are entitled to pay for it, whatever you do. I can't explain details because I don't know them, or say if that was about this very tax, but there is something like this in his plans. There were an estimation of more than 500 billion that escape our tax system right now in europe (dunno if it's every year or just a static number), and this is worth a big part of our debt today (our debt is 1650 atm). So if there is a legal way to avoid legal, or illegal, fiscal evasion, at least a little, it can only be a good thing because this money is genuinely supposed to be french, not sleeping in a numbered account in switzerland.
All in all, this was a political move, because at the end of the day, even if everyone pays this new tax, it's only 500 million euro more in the state pocket. It's far from being the solution of our problems (debt being 3200 times more than that, and growing). It's more a moral decision than a pure financial move. And the very highest fortunes have already evaded from our system like in any other country, to go to switzerland or wherever they go to, so it's not gonna affect those ones so much more I guess.
One can clearly see how good a free advertisement it was, because even yourself in the US are talking about it, while nothing else caught attention in his program. Talk about money, and you have all the ears in the world listening to you with interest !