The 3D TV blu-ray systems announced and shown this year at CES in Las Vegas use an active shutter system. The TVs support high refresh rates and have a IR transmitter to enable the frame rate of the TV to sync with the active shutter glasses.
Basically what happens is that during each successive TV frame, the IR transmitter tells the glasses to alternate allowing each eye to see. Each frame then appears to have been taken from a slightly different perspective. This happens so quickly you never realize there is even a shutter opening and closing in the glasses and your mind puts the images together to give it all a 3D appearance.
There will not be 3D DVDs, at least not using this 3D scheme. They will all be blu-rays simply because only a blu ray disc can handle all the data. What, if anything, is difference between a 3D blu ray player and a regular blu-ray, I do not know.
A 3D blu ray disc stores all of those data needed to show the alternating frames from a slightly different perspective, so the discs themselves are different.
If in this I did not answer the question you meant to ask, then please try to restate your question more clearly.