Shoutbox

Interesting that the two screenshots (or mock-ups) are from different stages - the one on the left seems newer than the other one.

The left one uses "Available" as a contact status, whereas the right one uses "Online"; The search for contacts word wheel has different text; The new emails icon on the right hand side of the contact list looks far smoother and more perfected on the left hand image.

I'd be willing to bet the left hand image is a newer build, either that or it's what they're working towards from the right hand image.