Yes, I really mean that high confidence. The Winds of Winter is the sixth in a series; the fifth was released in July, six years after the fourth, which was released two years after it was due and five years after the third book. The author is slipping, the books are getting longer and less manageable and the author enjoys watching football. He's also spent a LONG time promoting his latest book so aggressively I'm just about sure he can't have been writing for months. It's just barely conceivable he could deliver a manuscript to a publisher in 2012, but if so, it would be late 2012, and it would be published in 2013. It essentially would be fighting the barriers of what's possible for him to do for him to actually get it done in time for a 2012 release date. Another author might do it, but not him and not his thousand-page doorstoppers.
For a non-abandoned fic like HP:MoR, with 76 updates in 22 months, where Eliezer actually has the next chapter completed already and is just trying to do two at once, it will take a catastrophe to keep an update from happening this year. (Hmm. Given the high likelihood of a catastrophe happening, maybe I did guess too high there.)
I still think you are about 5% too high on both of those predictions, but at least you aren't being stupid in arriving at your probabilities.
(By the way, if you are wrong, you've done your future self a service by writing this comment - explaining in detail your reasons is one of the few known effective tactics against hindsight bias.)
Going through expiring predictions reminded me. Just as we did for 2010 and 2011, it's time for LessWrong to make its beliefs pay rent and give hostages to fortune in making predictions for events in 2012 and beyond.
Suggested topics include: Methods of Rationality updates (eg. "will there be any?"), economic benchmarks (price of gold has been an educational one for me this past year), medical advances (but be careful not to be too optimistic!), personal precommitments (signing up for cryonics?), being curmudgeonly about self-improvement, making daring predictions about the future of AGI, and so on.
As before, please be fairly specific. I intend to put most predictions on PredictionBook.com and it'd be nice if they weren't too hard to judge in the future.
(If you want advice on making good predictions, I've tried to write up a few useful heuristics I've learned. So far in the judging process, I've done pretty well this year, although I'm a little annoyed I got a Yemen prediction right but for the wrong reasons.)