Well at the moment the drivers are going to be exactly the same as the current X-Fi cards, just this card will have higher quality analogue outputs. We still don't know what form the DDL/DTS support will take, whether it'll be a module that you install along side the Creative drivers, whether they'll mod the latest Creative drivers to include it and add options to a control panel, or come up with something completely different.
Judging by their previous cards it'll just be a mod of the current drivers, no other changes, but it's impossible to tell without asking them.