From every single expansion announcement, it has taken a year or more to actually release it. Basing this on the other 5 expansions announcements and release dates, this puts X6's release date somewhere in the late August/ Early September range. There is no indication that this next expansion will break out of the norm, as the previous 5 expansions did not do so.
From attrition of the current sub base, one can only imagine what 14 months of HFC can do to the playerbase of the game. I think Blizzard only has 2 ultimatums.
1) Release X6 within 6 months (and rush it). This can lead to a worse expansion, and therefore an even bigger loss of the playerbase.
2) Release X6 when its ready (usually 1 year from now). It took just a few quarters for half the playerbase to leave. I cant imagine another 4-5 quarters of nothing.
Either way, I think the near future of the game isn't looking so hot.
Thoughts?