To say that there's been a bit of a drought of new Windows Phone 7 devices as of late would be a fairly accurate statement. Thankfully that may be changing soon, as it seems at least some T-Mobile stores have begun receiving sticker sheets like the the one you see above. Intended for use on displays, the stickers very clearly show a Windows Phone logo alongside T-Mobile's 4G graphic. Below you can see a photo showing the difference those same stickers and non-4G Windows Phone and Android stickers.
So what exactly may T-Mobile be planning to launch? There are a number of possibilities, but the first thing that springs to mind is the HTC Bresson. If you recall, the Bresson is rumored to be packing a 16-megapixel camera and appeared on a leaked T-Mobile roadmap back in mid-May. We've also heard that HTC, LG, and Samsung are all prepping 42Mbps-enabled smartphones for launch on T-Mobile. There was no indication that any of them would be Windows Phone devices, but it's certainly a possibility. Get excited, T-Mobile users!