Wow, that snuck out without much advanced fanfare (or I missed it).

I first glance, the main (in fact only) feature seems to be porting several iOS apps and features (notes, reminders, game center, etc.) to Mac OS X, and syncing everything together with iCloud.

There is also a Growl clone. Surprised this took so long. Then again, I personally don't like Growl, so I hope nothing depends on it being turned on.

I notice that, so far, there doesn't seem to be any new 'technologies', just (mainly) ports of iOS apps.

Looks very ho hum to me, but then again I have an android phone, so iOS syncing doesn't really interest me.