There is also this, which actually came out first this morning:
Hearing Oakland is third team involved in Reds-Rays deal. This should be fun.— Will Carroll (@injuryexpert) December 3, 2013
As Rosenthal later said, this definitely puts the A's in win-now mode, having traded away any significant prospect whose name isn't Addison Russell or already in the majors. It is unclear how the A's would be involved in a trade that was originally Reds-Rays only and involved Ryan Hanigan.
Update: the A's have confirmed the trade