Chances are this won't affect you whatsoever, but HTC has already released a ROM upgrade for the Asian variant of the Touch Diamond 2. This is especially interesting because the phone is just beginning to make it to market worldwide, and already we're seeing a major fix. This one involves the radio, which is what allows the phone to, ya know, be a phone. And that's pretty important.
The upgrade is free, but make sure you have an Asian version of the phone before trying anything. And we've said it before and we'll say it again: Back up yer schtuff before flashing anything.