I agree that CAL is likely to take back some of the major city flying from us with the new 737s, and some of those routes are really hurting for more capacity. Mexico is the mystery-it's a source of huge growth and revenue, but we need the LR and XR aircraft to do most of the Mexico flying, and those are the planes CAL wanted back (and we are keeping). How CAL is going to deal with that will be interesting to watch.
CAL tends to use a smaller airframe for a given market than other airlines, (73 to Vegas/LA, 75 to Europe, 76 to Asia/S America, etc) so even with the new 737s they will need at least as much regional feed as they do now.
There's not much coming down the pipe from the company, and as you might expect we hear a new rumor daily. I'm still hoping we keep most of the CAL flying, but if not, I'd personally like to do more Mexico since that seems to be a hot market. And I would hope the mainline guys don't shaft all of us (including themselves) and go for the Embraer 170/190.
And no, the flying won't be re-bid. CHQ won the bid, but how they get airplanes to fly seems to be the $69 question.