LionChief has NO advantages over LionChief+. Not familiar with the Batman subway cars, but as far as I know the original LionChief didn't have speed control. Some of those locos didn't even have a flywheel. Given a choice I would always take LC+.
A "universal" LC+ remote to control multiple locos would be a great thing. Even with the issue of multiple remotes I like this product line. Radio control direct to the loco was a long time in coming (although it probably could have been implemented 15 years ago by borrowing technology from other scales.) It solves a LOT of problems: no "ground plane" issues with over-and-under layouts, no "out of RF range" or "check track" errors due to signals traveling through the rail and arriving out of phase. Frankly, unless you were planning to control the whole railroad by computer, I'm not sure that there's any advantage to having a "command base." And if Lionel does release a "universal remote" with a USB port, it might STILL be possible to control the whole railroad by computer!
Panther97: yes several Legacy models have been issued which run on O48 and smaller curves. In steam you have the 0-8-0 switcher, 4-4-2 Atlantics and the 4-6-0 Ten Wheeler. Not sure about the K-4 and Southern Crescent but even if they make it they won't look right, with a lot of overhang. Among diesels I'm pretty sure the GP-9s were rated for O-36, maybe some other 4-axle models too. The Alco S-4 switchers had a shaft drive but I think they will make it around O-48. Note, all of these are true scale models. LionChief+ (at least the steam locos) are "traditional sized," which means they will look right at home with Plasticville buildings, postwar and MPC rolling stock.
Personally I would like to see Lionel expand this product line AND bring out a universal remote with USB port for computer control. My $.02.