Google focus group in Cambridge, $50 app credit

Google is looking for some people to partipate in a study or focus group of some sort, for 90 minutes next Wednesday or Thursday at the office here in Kendall Square. I don't know anything more about it except what it says on the form: "this study will help the Google team better understand your needs in order to incorporate them into future product enhancements." You get $50 in Play store credit (Android's app & media store) if you participate. Fill out this form if you're interested.