I too am disappointed about the weight gain, but the silver lining is that the new cooler should make for a lighter sled as soon as it's been on the snow. Getting rid of the cheap carbon fiber in the chassis isn't a bad thing either: it probably only accounts for a pound or so, and lots of guys go that way anyway after cracking or breaking the CF bits.
I don't think we'll see any big weight drops until we see an all-new chassis, and maybe not then. I think Polaris made a risky but wise decision from a marketing perspective when they focused on weight in the Pro chassis and did nothing exciting under the hood (setting aside the Dragon/Pro 800s' reliability issues). They can't just ignore the market looking to spend money on a turbo, obviously, but I hope they're not just thinking about HP for the foreseeable future. It's hard telling what they've got in mind for a follow-on chassis. I'd bet the current architecture is about as light as it can be made without unacceptable compromises, but that doesn't mean it's time to rest on their laurels. Somebody's going to come up with the next big thing, and you can't bank on selling refinements of what you've got indefinitely just because it's a challenging market.