Lionel says the following about the Base3 and LCS:
"The Base3 includes 3X PDI connectors for the Layout Control System. No longer will you be limited to connecting all LCS modules on a single daisy-chain. The Y-cable will also no longer be needed! See page 240 for LCS product!"
Clearly, Lionel is going to continue to support LCS. Add to it? We'll see.
I do wonder why Lionel is dropping the IRV2. They're working well on my layout.