In February this year, virtualization.info reported about VMware which exposed some of the upcoming features of vSphere 5 during its Partner Exchange. Last week even more details appeared online, these details leaked on a Turkish Web Forum, but were removed later. The post itself can still be retrieved from Google Cache though.
Besides, Distributed Resource Scheduling (DRS) for Storage, Host-based replication for Site Recovery Manager, and Network I/O control for Virtual Machines, vSphere 5 will feature: