The rumors of skull bash's awesomeness and lack of need for hit (at least as a bear) appears to be a bit dead now, as logs have shown that skull bash can actually miss. Well, okay, it could always miss - but the interrupt can now also miss, and that means hit is actually more useful than it was.
What I'm not clear about is whether or not skull bash uses the melee or spell table for hit. More testing is required. In any case, make sure to have some backup hit gear just in case you're the interrupt guy; interrupts are a Big Deal nowadays.