"Brian [Ferentz] was the Hawkeyes' offensive line coach (also working with the tight ends) the past two years after four seasons with the New England Patriots, and he just accepted a position on Bill O'Brien's staff with the Houston Texans."
Eric Edholm's article on Yahoo! Sports
There's nothing from the usual sports reports or official announcements, but thanks to grandmasteroz for bringing this to our attention.
If true, Ferentz would represent yet another former member of the Patriots joining the Texans' staff.