Google is pushing video chat for the tablet market. Honeycomb will have video-chat built it with Google Talk. Something that has been quite overlooked is Google Talk's video stabilization. They not only developed this for a better end-user experience, but the technology will help with bandwidth, which will help great amounts when on a cellular network.
The demo on stage was met with a problem involving the user not being online for chat, but they did end up demoing that video chat was up and working. Video chat looked pretty seamless, when the other user is online, the chat is initiated with a few simple clicks and then you're presented with your video while it connects to the other user.