I can answer some of these questions, since I helped develop this product with Neo Team.
1) It is shipped with a Neo3 slot2 card, your choice of DS, MiniSD, or MicroSD (Trans Flash).
2) I don't know about this.
3) It contains exactly the same motion sensors as the DS Motion Card. The DS Motion Card functions will work only after you send a special command to switch into the sensor mode. I will release a new function library with functions that are compatible with DS Motion Card, DS Motion Pak (slot2), and MK6. The developer will use 1 set of functions, and their game will work with all 3 types of motion sensors.
4) You got it.
5) It is a small ROM card/Motion Sensor. To turn it into a passkey, you burn a passme ROM to the card.