A few comments from me:
Colour scheme: As I mentioned before, dark text on a white background is very important to me, and I'm very pleased it has been confirmed that this will be available in the new software. I'm quite happy with Metal websites needing to look "metal" by having dark backgrounds, but often they don't give the choice to change to something easier on the eye. I can't stare at light text on dark backgrounds for very long (maybe 30 seconds)... I end up with the same visual effect as if I was staring at a light bulb or the Sun, and it makes me feel nauseous. It's also the main reason I haven't joined any Metal forums up until now, because they all seem to follow the same colour schemes that I don't like looking at.
Taptalk: This isn't something I'll use. I have an App, it's called the web browser, and it has all the functionality that I need, which often isn't replicated in other people's apps (increasing text size, finding text on the page, having multiple pages open, copy+paste of text... basically all the features I'm used to in a browser). Also, I've got a "crappy" modern phone with not much disk space on it, because most of it is used by the operating system and some of my apps won't let me move them to the SD card. So I avoid installing any apps that I don't need, and have even had to resort to uninstalling ones just to give me some space back.
Adverts: I'm running with an Ad Blocker on my tablet, and will be keeping it turned on. I have no objection to adverts if they are unobtrusive and don't cause performance issues. However, I have had ongoing technical issues with Flash and the current Android operating system (Lollipop). Basically, Lollipop doesn't handle Flash as well as it used to, and is full of memory leaks and keeps crashing, and Google won't fix it (despite me submitting numerous problem reports). Multiple adverts or embedded YouTube videos causes dreadful performance issues when loading pages, so I ended up rolling back to a previous version of Android and am running an Ad Blocker. If adverts were just static images or animated GIFs then that would be fine (as they still are on a few sites I use), but I will do my best to avoid Flash (ah-ahhh).
Mobile version: Make sure the mobile version is available on a tablet. I use a couple of websites where they make the assumption that I would only want to use the mobile version on my phone (presumably detecting screen size?), and don't give me that option on my tablet which is a bit of an oversight because it's still smaller than a PC monitor.