Supposedly DisplayPort is theoretically capable of at least one extra display, but Apple's tech specs page still says "an" external display, so I don't think th

Supposedly DisplayPort is theoretically capable of at least one extra display, but Apple's tech specs page still says "an" external display, so I don't think they've implemented that yet. Still, I'm thinking there might be Thunderbolt-compatible external video cards. Since the wire protocol is PCI Express, it seems possible, and performance should be better than external USB video cards.