Multi Carrier Rev B will be primarily for Incresing through out for older model so useres will get devided in dual carrier of EVDO channel, RevB Single Device multicarrier operation is quite possible now but they are not targeting it right now
WHat we will get is Faster Speed due to lesser congestion, Video Call dont have do with Tecknology is Pure Video-o-IP and its pure software based mechanism, if reliance moves to IMS based back hauls then Video Call is quite possible for CDMA with proper backend server and front end apps for Android phones.
Please search for RevB based OMH Datacasd or MiFi device we can ask Kalpak to go there and Test it for us !