Better to think of WAAS and DGPS as nav
sensors rather than approach procedures.
FAA's LPV minima for RNAV (GPS) approaches require WAAS. However, LPV procedures have no curved paths.
You may be thinking of RNP SAAAR (ICAO = AR) procedures with RF (Radius to Fix) leg types.
Examples:
Queenstown
Chicago Midway
Rifle, CO
FAA
AC 90-101 has more information