You may want to sit down for this one, HTC fans, because we've got a trio of leaked images showing unreleased handsets from your favorite Taiwanese manufacturer. First up is the HTC Radar 4G, the T-Mobile-friendly variant of the European Windows Phone 7.5 Mango handset that debuted earlier this month. There's no word yet on when the Radar 4G will be bringing its 3.8-inch display and white body to T-Mobile's shelves, but if you need a way to pass the time until we hear more, there's a bevy of shots of the Radar in the wild over at TmoNews.

Next up is a treat for U.S. Cellular customers. Below is an image of a device called the HTC Hero S, which looks like it could be U.S. Cellular's version of the HTC Kingdom. The Kingdom is also rumored to be heading to Sprint under the "EVO Design 4G" moniker. Interestingly, U.S. Cellular said earlier this year that it plans to launch two HTC Android phones this fall, which a USCC roadmap leak revealed to be the Desire II and Wildfire S. There's no mention of the Hero S on that roadmap at all, suggesting that this device could be a late addition or that it might not be launching until next year.

Finally, we've got a press image of the HTC Ruby / Amaze 4G for T-Mobile. We've already seen this handset leak out in the wild a few times, but this is the first official-looking render of the Ruby that's popped up. The Ruby / Amaze 4G is rumored to be launching in late October.

So there you have it, HTC-ers. Although there are still some details on these devices that are up in the air, mostly concerning launch information, it looks like we've got some pretty interesting handsets coming down the pipeline. And these are just the ones that we know of! Which upcoming HTC device are you most looking forward to?

Via TmoNews, Pocketnow (1), (2)