Actually, it seems like they are going to go ahead full-steam and give everyone short of the Wizard the Expertise Dice to handle weapon attack damage-scaling. They just aren't handing out Maneuvers to everyone to go with them.
Yeah, their statements on that struck me as very vague. Either I'm not understanding them or they don't want to show their hand yet, which is fine.
In any case, it seems like a rather boring way to handle damage scaling. But if that's the flat math equivalent of BAB, boring can work.
Whenever I've observed an Open Playtest (of a printed game, not a video game) it's looked to me to be about 90% marketing gimmick, 10% product shakedown.
I certainly agree they're trying to fend off the complaints they got with 4e, but this doesn't feel like 90% marketing to me.
Most of those playtests are feature-complete games released at, effectively, the end of Beta. Just, as you said, to shake out the last few issues and build some hype.
This is a different beast. Next is a game in Alpha or Early Beta, both in completeness and in the scope of changes being made.
Now, it's still entirely possible that they just needed a way to keep people occupied for two years while they finish the new game. Or it's possible they're following a software paradigm and trying to actually get feedback. I'd guess it's actually a mix of both.
If it's 90% marketing, though, it feels a lot more like damage control than building hype.
Cheers!
Kinak