Meh. Quoting the article below.
Classes gain feats at a rate appropriate to that class. Fighters might get more feats than wizards, for example. We don't have a universal rate where all characters gain a feat at levels X, Y, and Z.
I have mixed feelings. This ensures that feats will not be an optional module and makes them very difficult to remove, adding more complexity to the basic game (although see below...) I hate that because figuring out feats slows character generation down to a crawl so I'd rather feats be in an optional module. That said, if we have to have them, I like that martial characters get more of them, because I believe feats fill some of the same design space as spells. Both feats and spells are self contained packages of rules that supersede the core rules to let you do cool things. Spellcasters don't really need a lot more of that, but martial characters do.
A feat can be used to gain +1 to an ability score, to a maximum of 20, or to gain a special ability that is equivalent in power to that ability bonus.
The ability score bonus option does make feats easy to remove, so it would seem that it negates the problem for those of us DMs who might like to make feats optional, and for players who just don't care for choosing a feat. This alleviates most of my concern above. However, the "special ability that is equivalent to that ability bonus" part is just not true though...because...
Feats have level requirements, and higher-level feats are more potent than lower-level ones.
So at higher levels, you will probably be more inclined to select feats rather than ability score bonuses. And as some have pointed out, once you max your primary ability score, you get less from ability score bonuses after that, and of course increasing to odd numbers gets you nothing immediately. This isn't horrible or bad. It's not even messy until you consider the last part...
Finally, this approach has a fairly interesting implication for paragon paths and prestige classes. Feats are now more powerful than they have been in prior iterations of the playtest materials. At this stage, I feel comfortable that we can model many paths and prestige classes through sets of feats that duplicate their powers and class features.
I'm optimistic that this will be ok in the core basic rules. I think the page count limitations will enable them to design a list of feats that is mostly balanced and fun. But as the splatbooks and Dragon articles start coming out, it will become more and more difficult, and I fear we will end up with a huge number of feats again. I guess it's inevitable though, got to print something in those books and history proves that bad feats are easy to write and sell.
I really wish they'd chosen to make feats an optional module, but at least they've given us an easy way to house rule them out.
Edit: And of course I didn't see the post about the tweets. Glad to see they are optional. But I still have the same concerns about proliferation of feats and balance. We will see.