I asked a Nokia person about this and I was told that they are working on supporting video chat.

From what I can see these are possible reasons why video chat is not yet supported:

Google chat: Uses SVC (scalable video coding) extension of H.264 for video. AFAIK there is no open source decoder/encoder available for this and there may be no implementation which is optimized for the OMAP processor. So far Google hasn't even managed to provide a plugin which works on x86 for Linux.

Skype: Since video chat works on x86/amd64 Linux, the only reason I can see is that they have to port the codec to the OMAP, which may take some time and may not be a high priority for them.