Via the OKCNBAfans.com forums:
Apparently some worker snuck his tiny digital camera into the unpacking facility for "Thunder" gear, and it confirms our fears.
The name is Thunder, and the logo is butt-ugly. It looks incredibly generic. I mean, some might say photoshop, but it'd be impossible to photoshop through plastic. Some might say "unofficial" but the NBA logo is also on the basketball.
So, there's only two explanations from here on out:
1. The logo is legit.
2. The logo was made illegally by a local entreapaneur who is trying to cash in on the new team phenomenon.
1 looks very likely, but I'm hoping for 2. And if not that, PLEASE let this be a secondary logo.
A tip of the hat to The Lost Ogle.