iPad 3 Speculation - Thunderbolt:
With the grasp of the Thunderbolt technology, Apple is entirely possible to give up the USB port the first two generations used, and choose Thunderbolt port to connect faster smoother. Thunderbolt port can also connect multiple devices to meet the needs of powerful configuration and computing, so it is able to solve the problem that the iCloud service does not support file transfer. iPad 3 Speculation - Thunderbolt
iPad 3 Speculation - 3D:
For 3D, some may question: the cost is too high, and not worth the candle. However, 3D is now very popular, if there is a huge market demand, Apple probably will not hesitate to develop the technology which enables you not to wear awkward glasses 3D to watch movies, and integrate this technology into the iPad 3. It is reported that now there are already producers who began to produce the TVs which do not need special glasses 3D. So how do you expect iPad 3? What kinds of iPad 3 do you expect to see? The iPad 3 speculation above is just my thoughts, for reference. iPad 3 Speculation - 3D