Quit possibly worthless, but thought I'd contributor the one "source" I've personally heard.
My former close buddy is a big time poker player based out of Miami, and the GM of the W there is in deep to him so they keep relatively close contact.
Buddy saw my FB status and txtd me some **** and we talked.
Apparently the W's GM basically told him that Lebron had put in a booking for 12 rooms for Friday/tomorrow.
Could be a bad read on my friends's part or something lost in translation but sick to hear.