Yep I said that Allison would either leave the show or she would resign but only on a partial basis similar to Erica Durance's original contact which was for thirteen episodes, I'm not sure Allison will be back for that many (I get the feeling more like ten or so). Who knows what's in star for Kal-El indeed...I suspect that the writers summer meetings have already started discussing that very topic right now. Unless everyone is on vacation.
A friend of mine met someone at a party who's dad works on the Smallville set as part of the crew...not sure his name since I wasn't there and couldn't ask but thought that was pretty cool.