Sources speaking with Bloomberg claim Google is finally ready to take the wraps off its mobile payment service. According to a new report, Google will host an event on Thursday, May 26th to introduce its new service, which will initially be available only to Sprint subscribers in New York, San Francisco, Los Angeles, Chicago and Washington, D.C. who own the company’s Nexus S 4G smartphone. The system will be NFC-based, and Bloomberg did not specify which retail partners would support Google’s initial offering. Google has made a series of moves leading up to the imminent announcement this week, such as its recent acquisition of stealth Toronto-based start up Zetawire, which had filed a patent for “a payment system, an advertising system, and an identity management system” combined into a single product. While Google’s preliminary offering might not include unique technology such as Zetawire’s, it’s safe to say the Internet giant has a lot in store for us as it enters this emerging space. BGR has not independently confirmed that Google plans to introduce a new payment service, but we have received an invitation to a press event taking place on Thursday and we’ll be on hand to cover it live.