No idea. Anxiously waiting though. See no reason why FCC approval would be a hurdle though, since its just a WS1080 radio in a different box.
The facebook website for Whistler Group shows a working model and says news coming soon based on a posting a few days ago.
I don't think thete is any official FCC site you can check.
Mark
536HP/HP1e/HP2e/996P2/996XT
996T/396XT(2)/PSR800/PRO668