That's not true. White Lion will never get back together. James was just asked that in an interview. They talked about Megadeth and Endgame for like 45 minutes, and then the interviewer brought up that he was a huge White Lion fan, and asked him "If it wouldnt conflict with Megadeth, would you rejoin White Lion" and he humored the guy and said yeah it would be cool. But I asked him about it and he told me that it's probably never going to happen and that it wouldn't even be worth doing.
And he wasn't really going to leave Megadeth either (I know this for sure) - they did this Ellefson thing behind his back and he was forced out. He's not too upset about it though, working for Mustaine isn't the easiest thing - and James likes to be able to JAM - and in Megadeth you have to play the same thing exactly every night.