Still haven't see anything official from the Texans, but Ourlad's has the following college FA's on the depth chart:
Brad Lekkerkerker T Cal - Davis
Chavis Smith G Tennessee
Andrew Martin C Northern Colorado
Ryan Bachman T Kearney St
Tim Gale RB Northeastern
Because I care,
here's Tim Gale's bio. Dude looks like a throwback from the leather helmet days.