This is excellent news and the correct choice. You can read the official press release here.
David Simpson is one of the strongest fighters for conservative values in the Texas legislature, and has the integrity to lead it, as opposed to Joe Straus, the reasons being what Erick Erickson outlined here.
Named by the Young Conservatives of Texas as "Rookie of the Year", Simpson gained national attention for opposing the arguably un-Constitutional Transportation Security Administration.
You can learn more about Simpson from his website here.