Dont fool yourself, it will most likely be standard Classic Rock.
Personally, I wasnt too fond of the Kotobukia Rock. He looked ok, but without some Modelling know how, (particularly painting and how to remove the parts from the casing) it looks pretty cheap and not at ALL like the advertisements.
This Rock will probably be more proportionate too, or at least fit in with the rest of the D-Arts Mega Man figures.
Also, if they are making Rock, there's a chance we could see a Bass, which would be neat.
On Volnutt, I think it needs to be accepted that he will most likely be the LAST thing they touch, if at all, considering Legends is a touchy subject with Capcom right now.
It also seems more like they want to get the main 2 series out of the way first, X, and Classic, so they could possibly, (hopefully?) work on other series later.
(and I still stand by the argument he only won the poll because of the drama with L3, and it was the fans sending a message that they wanted Legends. )