Well I checked the site and all it gives for a description for the new bios is "Lastest release." Given that fact that there are no problems now and the new bios gives no noted solutions, I would leave well enough alone. the Revision 3 that you are running is the only would that gave details as to what it fixed, so I would stay with it until you here otherwise from Asus or a user of that actual board.
Screw overclocking my comps got <font color=red>NOS</font color=red>!!!!