Either way Revolver is and would have been sick. The HUD was crap and the camera was slightly closer but overall they're both cool.
No, Red didn't have a tail, that was a bullwhip hanging from his belt. Also yes that guy was flying (probably gliding) and was probably one of those special characters in multiplayer or a special chapter in single player (don't you tell me a character named flying eagle that could ACTUALLY fly wouldn't fit RDRevover so awesomely).
It also appeared much of the story remained the same, as did much of the multiplayer.
Lol, every time I watch the trailer it gets more and more awesome and similar to RDRevolver currently is.