For some reason, I don't think HD will be launched on the same day. Without assessing the channel performance, investing on a HD version won't make much sense. In case of Zee Kannada, though the channel has been on top charts, they have been wobbling on their decision to launch the HD variant and have finally launched it after almost 3 years of granting license from MIB. Adding to this, nowhere on the invite/media is there a mention of HD feed. I think they will take some time to launch HD.