An RTG driver would of course be awesome but nobody knows if this is possible or not yet.
What we *should* get though are some better AGA WB modes (higher resolution/better refresh rate) and hopefully some chunky modes which can be used for games development.
I'll be happy with it just the speedup i'll get by switching to interlace mode. Anything else is just a bonus

People criticize AGA for being too slow which it is, in multiscan mode, but I actually get 1.x quadra mac video speed in Shapeshifter if i run in interlace mode... just i don't want to stair at the screen, so I don't think it was that far behind Apple's video hardware of the time.