I doubt that it is in any way connected to TES V but the forum is going to be down for an extended period the next few days accourding to bethesda employee Nick Breckon http://www.gamesas.com/bgsforums/index.php?showtopic=1080081&st=60&start=60 maybe i'm just hopeful but i hope this means an annoucment is around the corner.
It could also be the book, but, as Antibody said:
:o It could be. The forum doesn't usually have "significant downtime" longer than a few hours, and even that is rare. And GDC is starting tomorrow. It could totally be a coincidence, and it probably is, but who knows. Maybe they'll announce it in the coming days, and they're doing maintenance on the site to control the flood of posts coming from an announcement.
It is a distinct possibility, even though Zenimax, and not technically Bethesda, is going to be there. It is possible.
It might just be a forum upgrade.
But lord help me if I log back on and at the top I see "TES V- Skyrim General Discussion".
I would, if you'll pardon my vulgar expression, likely have a bad case of sticky keyboard.
GDC 2010 starts today and will last for the next couple of days, and it wouldn't be odd if we got an announcement there.
Hope and pray, mi amicos.