All the WRCs will be there, including the S-Curve, 45° Bend and small (2x2) and large (4x4) 90° bends. These will be supported for all SAM networks in NAM36 thanks to Eggman121's work on them. I didn't use the smooth curve here because it made one of the lights on the diagonal go out and I'm not ready for the pain that is lighting up WRCs quite yet.
Actually, I've even coded a working prototype for the diagonal roundabout and cull-de-sac roundabouts. But those won't likely be there until NAM37.