The Texas Legislative Council has a terrific redistricting section on its website, with full statistical reporting on all of the new maps, including geography, demographics, incumbencies, and election results all the way back to 2002. It's easy to use and open to the public — a model of how to make information available (we're fans, in other words).
More importantly, it's the agency that has handled map drawing for the Legislature and for the federal judges in San Antonio, so the information is The Information. Here's a link to the page with all of the data. Use the district viewer (here) to look closely at maps, down to the house level. And you can compare maps to see how they changed from current law, say, to the legislative versions to the court versions.