So check this out. "The Empty" is still angry that it's been woken. It decides that Castiel's sacrifice isn't enough to appease this anger and now wants everything to be empty. Jack is out of his league and feels he needs to "Winchester" the Empty. So he returns Sam and Dean to aide and assist. Sam looks for his son and finds out they're a bit into the future as his son has aged and gained even more knowledge of the lore. After meeting Dean, Dean finds out that Dean is now the owner of "Baby" and it's still loaded with hunting gear including Sam and Dean's Hunters Journals. And then .....

IMO the new take on the super suit is great. Earths yellow sun give Superman strength and powers. Nowhere is it ever said it gives him super physique. Look at the original Shuster and Siegel comics. Dude is not ripped. He's supposed to be an everyday man that happens to be an alien with incredible enhancements sure to his alien physiology.