Expected to retain dining car designed exclusively for DQ (but I like the idea of it becoming more widely available... still long for days when my favorite train, 1 down/2 up Bombay-Howrah Mail used to run with one.
I also heard that DQ will have a push-pull set up, so it should make it a bit faster. However, it will also impact Vistadome option as there will always be a locomotive blocking the back view which currently only happens from CSTM to Pune