After doing some research, it seems the new grizzly hybrid G0715P has the same guts as the Craftsman 21833. According to the parts diagrams in the respective manuals the entire trunnion assembly, motor mount, and elevation/tilt mechanisms are identical. The only difference is the handwheels and riving knife attachment.
Craftsman: http://c.shld.net/assets/own/00921833e.pdf
Grizzly: http://cdn5.grizzly.com/manuals/g0715p_m.pdf
This is significant to me because of all the blade alignment problems that people have had and continue to have with the Craftsman. Problems with trunnion bolts, cracked trunnions, and blade going out of parallel as the height is changed.
I was one of those who got a bad Craftsman earlier this year. I got a replacement from Sears that has no alignment problems, but promised myself I'd only keep it until the Grizzly hybrid was in stock. I saw the manual on the Grizzly site today and started looking through it. To my surprise in addition to identical guts, the Grizzly also has thin metal table inserts and the same miter gauge as the Craftsman.
I have an order in place for the Grizzly, but I'm going to cancel it and stick with the Craftsman. It's not all bad as it seems that though the internals are the same on both, you get a better fence, better blade guard, cast iron wings, and a full cabinet on the Grizzly. However, no mobile base.
The Craftsman can be purchased on sale for $410 plus tax (plus $65 delivery). The Grizzly costs $891 delivered with lift gate service, a mobile base would be another $100. That's around $500 difference for a better fence, guard, wings, cabinet, but essentially the same internal parts. I just can't justify that for the Grizzly.