Nobody knows except the devs; it's not out yet, beta invites will start to be sent out within the next couple of weeks.
Actually I'm sure it's little more than a 'Github 2.0' client for now, a concept, with the details to be fleshed out after user feedback (hence the beta).
Hopefully this client will be less toyish and geared towards more advanced users. The existing client really feels like a one button solution to everything.