just got my New Years Day flight back home upgraded (I hope this is the case) from a 738 to a 75Y. PHX-ATL. Outbound XMAS EVE leg, ATL-PHX was a 739 when I booked, is now a 75HD. Looks like if things are left alone I get to try 2 revamped 757s. Am in C+ both flights. My only other prior experience with the 753 was CO from IAH-LAX, when the 753 was a nearly new aircraft.
They even switched out the CHA-ATL and ATL-CHA legs from CRJs to 717s. Hope they leave it alone.