It looks like the coming upgrade to Android - not in the public code, and named Cupcake - will include framework updates, some bluetooth additions, MMS attachment support (okay, so this is a little iPhone), and yeah, video.
And since it's all about intents, applications and the operating system easily share what they can do (their intents) with other applications. So I'm not going to be surprised to see some video call apps hit the market.
On another note, the HTC service manual hit the internet. So if you've just been waiting to completely disassemble your phone, good news.