The HDMI Licensing group has solved at least the Blu-ray side of the 3D problem. All devices with HDMI 1.3 and an upgrade connection method — Blu-ray Live decks (including PS3), satellite receivers and cable set-top boxes — can be upgraded to output 3D.
The problem is that for a 3D picture, two images have to be shown nearly simultaneously. Since HDMI 1.3 can’t handle two 1080p pictures at that speed, you’ll get two 1080i pictures. With HDMI 1.3 cable boxes, you’ll have the choice between HD and 3D, but not both.
Source: High-Def Digest.