Originally Posted by bcmobile
There is a thread about this here which includes a link to the video you refer to.
Glad to be here! I'll be even gladder when Clove deliver my Sim free handset...
The vid in the link relates to a Nexus phone, so this muddies things a little. However, I've seen other vids from the MWC showing that the keyboard on the Desire did indeed at one point have the mic icon on it.
Some people are speculating that retail/sim only units with have the feature enabled, but I don't think that will happen. As said above, I think it was simply that even though V2T is a standard feature of Android 2.1, it probably wasn't very effective without the noise cancellation hardware.
Nevertheless, it will be interesting to see just how well the Desire can do this - I've seen some videos of the V2T in action on the Nexus and its quite impressive.