Anyways from what was said here by Cisco Employees
#1 L2 Transparent firewall capability.
#2 U-turn on VPN Traffic on the same interface.
ie: you can disable split tunnel and surf the net using the corporate network.
#3 Active Active failover/loadbalancing.
I would Say FOS 7.0 is probably the most significant major release ever, my prediction but I could be wrong.
Guys any other scraps of information for us :)