Hands down the PS4 version of this game is phenomenal and there are very, very few things I don't like. Though new to the series and still in the process of learning all of the ins and outs, I was thinking about a few things that new to be added moving forward.

RTTS:

-transactions logs (for the team and the league)
-more interactions with management (eg. promotion/demotion discussions, team specific trade requests, etc.)
-alternate unis in AA and AAA leagues
-more dynamic and enhanced presentation (it is very repetitive)
-significantly enhanced presentation for championship games/series


Not necessary but would be nice additions:

-Japan League (or some international leagues) that could be an option in RTTS
- single A squads (not all, just one per team)
-RPG-like interviews / interaction with the press


I will add more to this list once I get more into franchise mode.