USB 3.0 adoption will be slow - No Intel backing yet
 

A couple of days back we wrote about a new Gigabyte motherboard with SATA 6Gb/s and USB 3.0. You might look at it as a sign of things to come, as other vendors are quietly developing boards along similar lines.

However, don't hold your breath when it comes to USB 3.0 support, as Intel isn't exactly in a rush to put its weight behind the new standard. According to EE Times, Intel won't support USB 3.0 in its chipsets until some point in 2011, and vendors who opt to add it to their motherboards will have to turn to costly third party controllers.

http://www.fudzilla.com/content/view/16080/38/

To be expected, as it wasn't in P55 can expect it with the new chipset+socket that will launch with Sandy Bridge.