GMAC announced at a conference last fall that they would be releasing the 12th edition of OG sometime toward the end of 2008. I wouldn't absolutely bet on that release date though - they released both OG11 and GMATFocus later than they said they would.
At the conference, the guy in charge of all of the research (the questions and the algorithm) did NOT say it would contain new
types of questions. He said it would contain newly-retired questions that hadn't previously been released to the public. He also said they were explicitly trying to make sure that they didn't have American-centric (and, therefore, biased) questions in the pool, and they were stripping out problems that expected people to know things like the local currency, etc (either literally removing the questions or providing conversion information as part of the question - that sort of thing).
We have been noticing a gradual shift in terms of their preference for certain content areas and question sub-types. Eg, weighted averages have been more common; combinatorics have been less common. In CR, analyze the argument structure has been decreasing in frequency; explain a situation / discrepancy has been increasing. That sort of thing.
jiujitsubri - be thankful that you are blissfully ignorant of the scoretop fiasco.
If you're curious, do a search on the site and read some of the threads - there's a lot of info.
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