A comment in a blog from Brandon Funston, aka one of the Yahoo's.

Ladies and gents,
Let me set the record straight as much as I possibly can. The plan is
for us to launch next week. As I mentioned in a previous post, we have
some new features for this season and care is being taken that we
launch without any hiccups. Just to give you an idea of some of those
features:
Keeper leagues
Mock drafts
Expanded playoff options
Custom draft order
Draft applet that debuted in football
There's more, but that's a sampling. Ideally, we'd launch without
having to give a specific date because you never know when last-minute
details are going to bite you in the butt. But clearly the desire for
some kind of clarity within this blog is running high. So, if
everything goes according to plan, we'll be live mid-week of the
coming week.
If the need to draft a league now and sit on it for two months is so
great that you're willing to switch allegiances to another company,
well that's a shame. We'd hope that a few extra days in early February
is not the basis by which you decide which product to use.
Ok, so that's the official unofficial word. The Brad Evans inposter
early on in this mock that said we'd be live on Feb. 5 had no clue
what he was talking about.