Steve,
Unlike the TIU, the DCS Remote has been pretty much unchanged from the very beginning. The only noticeable change has been that several years ago the thumbwheel was changed to one with coarser grooves. If there were any "under the hood" changes, they went unreported.
Just update the remote's (and TIU's) software to DCS 6.,1 and you'll be good to go with the latest and best DCS software ever.