Terrain,
After the cabin upgrade ALL the B747 fleet will have in-seat videos throughout the cabin.
The B767 fleet does not have in-seat videos in economy class as the weight of the equipment (seat boxes, screens, cabling etc) is too great.
The first of the A330s to be delivered are -200 series and these unfortunately will only have in-seat videos in business class. The economy cabin will have "drop-down" video screens which automatically lower from the cabin ceiling when in use. The aircraft will be equipt with all the wiring and boxes for a full IFE setup, but due to time constraits it will be operating at a lower functionality than desired. The aircaft IFE will be upgraded a short time latter, after delivery. Then you will be able to watch a selection of movies or play games to your hearts content!