If you'd like to try the myTouch experience by sticking it onto your phone, you can find the ROM right here. I suggest if you've never modded your phone that you spend some time reading a few sites dedicated to that fine art before you end up with a very expensive brick. Here's a good place to start.
Who knows what could be in the ROM! Let us know if you find anything new and different in this upcoming phone's software. With a codename of HTC Glacier, we'd love to know if it's big and slow, or just crushes the competition. But we had heard the phone itself was getting WiFi calling. Maybe the ROM is enough? Let us know!
Just remember this ROM is designed for a 1 GHz Snapdragon MSM8255, so don't expect much if you try it out on something underpowered like an HTC Hero. (Kidding!)