Although I'm definitely a C64 man, I backed the project as I've always wanted to play around with a Speccy but wasn't particularly interested with dealing with the old hardware. All those bizarre peripherals even just to get joystick ports!!! I tried for the early bird but Kickstarter hung up when making payment as there were so many competing for it at the same time. Oh well, I backed the accelerated version and will be quite excited to mess about with it when it finally arrives.
It wouldn't surprise me if they ship both versions at the same time, i.e. the plus and the accelerated. As far as I know the only difference is the addition of the Pi Zero so producing the two versions concurrently shouldn't be a big deal.