The new R2C shifters look and function identically to the old ones, with two exceptions. First, the front shifter has no more trim positions, making for a faster shift. And the action is now a little lighter, thanks to new tooth shaping on the internal ratchet.
SRAM has been pushing its new Red group all year, but had lagged behind in updating their excellent R2C shifters. But now they've fixed the situation with the brand new YAW-specific version of the R2C shifters, as well as new YAW-specific TT chainrings. Check out the article for all the details on these new components.