6:41pm: The team officially announced the move in a press release.
10:27am: The Thunder have re-signed Orton to the NBA roster after he joined the D-League's Tulsa 66ers, according to the Oklahoman.
9:15am: Having waived him just a few days ago, the Thunder are expected to bring back Daniel Orton, according to ESPN.com's Marc Stein (Twitter link). Oklahoma City released Orton, along with Andy Rautins and Hollis Thompson, prior to sending four players to Houston in exchange for Kevin Martin and Jeremy Lamb, which opened up a pair of roster spots.
When Orton was released by the Thunder on Saturday, Royce Young of DailyThunder.com wrote that the team was expected to retain the rights to the Oklahoma City native for its D-League affiliate. Assuming Orton officially re-signs with the Thunder, the club could still send him to the Tulsa 66ers, where he'd receive more playing time and a chance to develop.
If and when Orton's deal becomes finalized, Oklahoma City will have one open roster spot left, with 14 players under contract. Darnell Mayberry of the Oklahoman (Twitter link) doesn't expect the Thunder to fill that spot, given the flexibility it adds, not to mention how close to the tax threshold the team is.