From the original wording, I thought things would be replaced. So, Pulse and Pulse S will have an additional digital input via AES/EBU XLR, and Pulse X will have an additional digital input via S/PDIF RCA. Were these changes due to the fact that they had trouble getting the balanced outputs crammed into the original chassis?
More than likely this change was brought about to simplify production by only needing to machine a single back piece for all 3 pulse models. But whatever the reason, it's an approved and welcomed change.