So, in theory, the new PS 3D HDTV could allow 8-splitscreen mulltiplayer, right?

[disolitude]

Here is an adapter which Texas Instruments and RealD made few years back that did this for DLP based TVs(no ghosting). It costs 2000 dollars :)

http://reald.com/content/proProducts.aspx?pageID=119

It was going to accomplish the same thing, using 2 consoles -
http://www.youtube.com/watch?v=QGuXlNe6s7s

But Texas Instruments never released the glasses because Samsung And Panasonic bailed on DLP technology TVs few months after that.