Having just done mega-nostalgia in #344, we didn't want to go to that well again. Instead, we decided to pack the magazines with as much awesome content as possible.
The contents list for the last Dragon isn't quite correct. The issue will not feature a "Core Beliefs" (that one's going in #358), and the summary doesn't include some really cool ideas that are still being worked on. It looks likely that the final magazine will include a final "Wizards Three" article from Ed Greenwood, too, which should be an exciting conclusion for that series.
--Erik