Preview at WWDC likely in June, followed by September launch.
CVS Stores Reportedly Disabling NFC to Shut Down Apple Pay and Google Wallet
It now appears that fellow major pharmacy chain CVS is following suit and as of today is shutting down the NFC functionality of its payment terminals entirely, a move presumably intended to thwart Apple Pay. Google Wallet services are obviously also being affected by the move.
Multiple reports on Twitter and the MacRumors forums have indicated that CVS has sent an email to its stores indicating that NFC support is to be turned off. It is still relatively early in the day in the U.S., but we are now starting to see reports of NFC indeed being turned off at CVS stores.
The reason behind Rite Aid's and CVS's moves to disable unofficial Apple Pay support in their stores is presumably related to their participation in Merchant Customer Exchange (MCX), a retailer group developing its own mobile payments system known as CurrentC. A claimed internal Rite Aid message shared with SlashGear supports this notion, instructing cashiers to explain to customers that Apple Pay is not supported but that MCX's solution will be available next year.
Rite Aid's and CVS's moves are also in stark contrast to competitor Walgreens, which has fully embraced Apple Pay and is one of Apple's launch partners for the service. With over 8,000 stores around the United States, Walgreens has been one of the most popular locations for those testing out Apple Pay over the first week of availability.