The Rangers have a roster move coming tomorrow, to make room for Rich Harden on the roster, but it sounds like that might not be the only move...
According to Jeff Wilson, Matt Treanor is supposed to be activated tomorrow if his rehab start in Oklahoma today goes okay. If Treanor is activated, Taylor Teagarden would be optioned to AAA.
Teagarden would, of course, be recalled when rosters expand on September 1, and presumably would be the third catcher the rest of the way.