The 2nd Super Robot Taisen OG introduces an "ability slot system" where each pilot and robot gets three ability slots. Twin Units, one in game piece with two robots and two pilots, have a total of twelve slots. You will have default abilities equipped when the game starts and if you defeat enemies you can obtain new ones. If you want to activate an effect you need three of the same abilities equipped to either your pilot or mech.
Scans from Famitsu also say you can adjust the difficulty for SR points and as an OG Saga series first there is an archive mode. The scans cut off after the headlines so we’ll follow up with more information when it leaks out.