5th edition deal-breakers? I'll give Monte three strikes.
1) Feats being hard-wired into the core character rules.
2) Attacks of opportunity being hard-wired into the core combat rules.
3) Monster stat-blocks taking up more than about a line of text on a two-column page. Monster, AC, hp, HD, #AT, Dmg, SV.
The latest transcript implies that the game still has feats, so that's strike one for me. But Monte and company have a chance to hit a home run, if they come right out and say that the whole "character build" thing is just an opt-in from the start.
If, however -- and this is a pretty darned big "if" -- if the way you opt out of feats in 5th edition is to take a default build with all the feats pre-selected, then the whole "layered complexity" thing will have turned out to be a crock after all, and tough noogies, I ain't switching from BECM.