Traveled today from DEN to ORD. New boarding rules in full effect for Econonmy passengers. No longer window, middle, isle. Now we board from rear to front. Realizing most on MP are not traveling via "cattle call", but be aware FA's do not seem to care if carry on's from passengers seated in the back are loading in E+ (just my recent experience) may take some time, and the sqeeky wheels to light a fire under FA's. Be aware!