The details of the standard are here: http://dvb.org/technology/standards/a154_DVB-3DTV_Spec.pdf . Basically half res standard as usual.

The emerging new standard is DVB-3DTV “Phase 2a”. Apparently has added definition for "peel-off" eye for 2D only viewing.

... "Termed “Service Compatible”, the second system is a solution required by content deliverers that enables the 2D and 3D versions of a programme to be broadcast within the same video signal, so that new 3D televisions and next-generation STBs can receive high 3D programmes, while consumers with existing 2D HDTV receivers and set-top boxes can watch a high-quality 2D version. This 2D picture will probably be either the left or right frame of the 3D “stereo pair”."