Having read all the comments here I would like to cast my vote for a 1.5 version rather than something based on the current beta.
Especially the comments about combat being slower and requiring more book keeping had made an impression on me.
Combat should be simple, fun and fast rather than providing a lot of gory details. If anything, a new version should make combat much simpler.
Also the lack of compatibility with the other current lines is IMHO a bad move.
I want to comment on this because I do agree what this man is saying. You want combat to be resolved quickly and have it streamlined. What you don't want is to keep track ever single hit and effect. I been that road before and it sucks.