I emailed bebook earlier asking when they would have mobipocket support and their response is below.....
"The update is rounded up, but we're out of the office next week because of a trade fair. We will release the update when we get back."
So at a guess that would be what maybe 2 weeks? I'm not sure how long the trade fair that they are talking about is though....(im guessing a week...) either way its looking good.