It does make sense though. Developers only really want a way to verify the user exists and isn't some spammy bot. Verification like facebook login is the easiest way to go. The problem has always been - far too many people avoid signing up with facebook as it shares "god only knows what" with the site. This works around both issues and really is the only way they can become the single signon entity. Which is what they've been aiming for.
As for "not bothering to implement" (aap), if you already need to handle facebook connect login, its going to be minor to add anon login facebook handles all the identity stuff leaving your app clean of yet another verification loop which annoys the hell out of users.
Sure there is the "apps need that data to make money" situation, but as a matter of fact, the people signing on anonymously were a) going to create a fake facebook or b) signup manually and give you a mailinator address.
Such as?
They're improving collaboration in all products, ie bringing it on par with gdocs.
Something geospatial, dont recall exactly what, maybe it was to do with SharePoint or colo.
The most interesting was they're letting go of forcing ms languages for plugins and allowing you to write and import widgets/plugins as html/js so all those nasty vb scripts of old are going to get some much needed love from all the web devs out there.
I could be wrong on a few of these just what I recall hearing about, happy to be corrected if I misunderstood any of what I was told. Mostly it just sounded like, as a company, they're identifying what their core products are and innovating on them. As in strategically, they're getting their shit together.
That sums it up nicely.
And actually, the thing is I could totally see Facebook enabling truly 'anonymous logins' and whatnot, because it can afford to do it at this point. It is too entrenched as the social king, no other competitor comes close to it, and it's not going to fall down anytime soon because it'll be buoyed by networks effects for quite some time... and so it makes sense to ease things up a little to improve their public image. But, the way they got there, to the top, was by using dirty and despicable dark patterns, like 'Privacy Zuckering': http://darkpatterns.org/library/privacy_zuckering/ For this reason alone, I would stay the hell away from anything Facebook.