http://www.fly2houston.com/0/3921679/0/83280/
Airport PR on the setup at IAH.
Looks to be 20 kiosks. My cousin went through a couple of weeks ago and said it was under "construction" on the south side a few "rows" behind the GE banks (15 kiosks)
pic
Second PR from airport with additional info:
http://www.fly2houston.com/0/3921678/0/83280/
"The Houston Airport System and U.S. Customs and Border Protection have recently launched several different partnerships designed to expedite the arrivals process for international passengers. The City of Houston stands as one of the most active areas in the country in regards to participation in the Global Entry program. IAH is one of only two airports in the nation to offer expedited entry through a program called OneStop and Houston was the first city chosen to be a “Model Port of Entry.”"
EDIT TO NOTE:
It seems to hint ten airports in total will receive these to start "“The Houston Airport System is among a leading group of 10 international airports that value both excellence in customer service and security"