The locations are as follows:
Funworks in Honolulu, HI
Super Arcade in Walnut, CA
Round 1 in City of Industry, CA
Arcade UFO in Austin, TX
Next Level Arcade in Brooklyn, NY
As of today the USA is also connected to the worldwide TEKKEN NET.
You can register here: http://exam.tekken-net.jp/tag2/
Namco is a huge player in the arcade scene and if they make money off of networking their games here, we, (in the US), might see more networked arcade games in the future. Which, in turn, can only be helpful in the arcade revival (not to mention the future of US Tekken). Wouldn't you like to play arcade games with a worldwide high score table? I would! Even if you don't live close to a location test, or care about Tekken I think it's a good idea to at least sign up!
That's all for now! Support your local arcade!
Discuss this topic on the forums!