these r just rumors ,this thread was started on 15th Jan still i cant find s6 in the market.
Of course, this is just a random wishlist thread when Bitmain already said the next unit was the S7, the S4+ and the S5+ fill that gap for now, apparently.
Me i'm guessing the S6/S7 will be in 0.3X efficiency range. There would be no point for a S6 at 0.44, that'd just be a S5+ enclosed in a shell, more shipping costs for fitting in U racks.