I was playing at a private social club in Houston last night and what I heard from a couple folks, that I would consider to be more well informed than most, was:
The clubs were tangential to (same persons involved) a money laundering investigation that had been ongoing for about 2 years. The same people that I talked to did not express surprise that those arrested were implicated in money laundering (as they were widely considered to be involved in much other crooked shit.)
I also heard that another club (The Mint) in the Houston area was raided, but have heard no other verification of that.
The Harris County DA was the face mostly being seen on and quoted in the media, the HPD was the muscle on the raids, but the, authority was from a three-letter agency out of Washington, DC with local offices everywhere.
No other rooms, that I know of, were directly affected and the cards were in the air as usual at the unaffected clubs.