Recent buzz besides Garza is Senator John Cornyn of texas. Several have said he was called to the White House this morning.
Probably just to consult. He is on the judiciary committee.
That could also mean that it's Gonzales (who I would personally oppose - of all the supposed candidates he's the least appealing) and that the White House is tapping Cornyn as his "sponsor" to shepherd him through the technicalities of the confirmation process.