Surprisingly, news broke today that the final Wheel of Time book, A Memory of Light, is being delayed until 8 January 2013. This is two months later than the previously-mooted release date of 1 November 2012, which is not a major delay as these things go. However, previous information from Brandon Sanderson (who has completed his first draft and is ploughing through a second) indicated that, if anything, there was a chance of the release date being brought forward, perhaps as soon as this August.
As Sanderson explains in this blog post, that possibility died a death when the novel came in 40,000 words over-length (the finished novel is currently estimated at being 360,000 words in length, making it one of the longest books in the series, though still behind the huge fourth and sixth novels), extending the amount of lead-time needed for production and editing. However, even he says that he thought the November date was a lock and the delay to January a surprise.
The delay is probably unavoidable - Tor would not miss the lucrative Christmas hardcover market for anything that could be easily resolved - but again, in the long run, it's a very minor delay for the final book in one of the most popular fantasy series out there.