If their 12th album is self-titled, I propose the following as fan-wide abbreviations:
DT12 (likely to be the most common)
DTwelve
D12 (pronounced Dee Twelve, like the dice)
Either way, I too like the idea of a self-titled album at this point. Interviews with the members point to a very unified band feeling now, with everyone on the same page as far as musical and technical prowess and skill. They're more DT than DT has been, and if the album lives up to the hype, I think it would be a cool move to name the album Dream Theater. What'll be more confusing is if there's a TRACK called "Dream Theater". Then we could say, in one sentence - Hey, did you like "Dream Theater" by Dream Theater on their album Dream Theater?
-Marc.