HDFC Bank has filed for trademarks for "HDFC Bank Travelluxe Credit Card" and "HDFC BANK TRAVELLUXE Label". It seems it would be a Travel + Luxury (TravelLuxe) focused card. No other details are still available.
Yes seems so, this is the first mail which mentioned travelluxe but didn't find any reference in website and app also shows hdfc Marriott bonvoy diners