I think Lionel's Engineering team is trying to make their newer LEGACY electronics DCC compliant. MTH's DCS is considered dead right now with MTH going out of business. DCS is a clunky proprietary DCC system anyways. If I was you stick with DCC and the newer Lionel Legacy items. Convert older items to DCC and such.
If this happens, is it possible that we might be able to control legacy locos with DCC and vice-versa?