I posted about this on the "general" board and it probably should have been here, so.....
a couple of thoughts:
1) Trading has been wild and you're exactly right it's traded in a roughly $20 range all morning. The market clearly can't value the stub.
2) In its old incarnation, GMCR was heavily short. I didn't short it, but I knew smart people who did.
3) DPS is a good asset. They seem to have a better grip on the move away from colas to non-cola softdrinks. As an aside here, I owned DPS in the low teens after the Cadbury spinoff and sold in the $50s some years later, so, based on today's pricing, maybe my perspective is no better than the GMCR shorts.
I actually bought some DPS today at $118s. At that price, with the $103.75 cash component, the stub is under $15, paying a .60 dividend, its a 4% yield. That's a simplistic, non rigorous way of looking at it, but post closing, I would wager the stub is more likely to open in the $20s than at $15.