I dont know what B2 could offer after a decade of mods besides a better refined/optimized engine. The base game has been so mod raped that it could never live up to expectations unless they advertised it as a solid foundation for mods
Better optimization, more modding capabilities, ability to deploy battle armor, vehicles and aerotech (without janky mods), fighting infantry and, most importantly for me, an actual BattleTech universe to explore with a variety of campaigns, party members to find and recruit (with their own quests and interactions), a campaign that is actually focused on the player (ala MW5), instead of the player being a side character in a troon's YASS KWEEN SLAY fanfic about a nigger woman taking what is "rightfully" hers.
Actually, give me one BattleTech campaign where what my character does actually matters for the wider setting, instead of everything being relegated to a sidenote that can be safely ignored. I want a story, or stories, with bigger stakes.
Side with a great house and become a noble, be a mercenary, be a ComStar agent, fight for the Clans, fight against the Clans, become a Solaris VII champion (and you could make a whole campaign out of arena battles, the personalities and drama of the competition), just fuck off into the deep periphery to see what you can find, encounter weird and spooky stuff, chase down urban legends, go on a hunt for a buried treasure etc.
I want an actual BattleTech sandbox RPG.
Hell, I'd love sections where you get to explore cities on foot (though I understand this is likely to come across as controversial) and actually experience the BattleTech universe as more than a combat map with mechs and vehicles on it.