1) i HAVE REAad in many places that Satoshi owns still around 1 milion of BTC (or even 1,2 milion). Is that a rumour or is it true...?
2) Is the adresses (on blockchain) of these coins known? Can they by tracked? (if he moves them?)
3) Did he move the BTC sometime after his disappearance?
The answer is in the blockchain! Start from here
https://blockchain.info/block/00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048 and move forward. This is the first block, by any mean mined by Satoshi. You can see to which address the 50 newly mined bitcoins went and if they moved or not. Since the blockchain is open to everyone, you can see if those coins move.