Just updated. Nice to see some Android love, and notifications now open in the app (Thank you, Flying Spaghetti Monster!). Places and Groups are nice. I still use Foursquare and not Places, but still...nice to have.
Still no chat though, and notifications still only include messages, friend requests, and event invites: still no notifications for replies to my posts, which is just a very very odd ommission.
I am not familiar with the iPhone version for comparison, but I believe it has chat, right? Anything else we're missing compared to it?