Not sure what will happen definitively, but if I had to guess, I imagine that Bob will coach through the remainder of the season and the tourney. (Especially if as some have suggested, there is a $100K buyout that disappears on April 1).
If that happens, I assume all the current assistants will have to look for new gigs. I can't envision a new coach retaining any of the current staff. You don't typically see assistants get retained in basketball (but it's certainly happened before).