So, I came across a recent interview with one of the developers for Dragon Ball Online, and as much as I really, really hate to say this, it looks like they're adding Super Saiyan 2 into the game. It was only briefly mentioned, and the interview's all in Korean, but I popped it into Google Translate. It's mentioned briefly for one line, and then an image is given at the very bottom, and it's reposted below.
Unfortunately, there hasn't been any word on Namekian or Majin transformations, nor were there any images, so only time will tell what will happen to them. The developer mentioned that he wanted to include this in the upcoming patch where they're going to implement air combat, so it'll be one more thing for the lot of you to look forward to. (Or possibly not to look forward to, if you're not playing as a human)
Obviously, I wouldn't give you any big news like this without a source, so
here's the original interview in Korean and
here it is again run through Google Translate so that it's in English.