QVW is the main application file format for QlikView. An equivalent for this in QlikSense is a QVF. You can convert a QVW into QVF by just opening a QVW with QlikSense.
QVD is still the same even in QlikSense. No change here.
Migration from Qlikview to QlikSense is pretty simple. You only have to develop the front end and make use of the existing data model.
It would be very handy if you go through all the content : mto by Michael Tarallo