Who watches his addresses??? How will we know when if/when any are moved?
It's easy to know when they are moved, just look it up on blockchain.info or whatever blockchain browser of your choice. What's "funny" is, it seems the early addresses may be prone to quantum attacks (not post 2012 addresses) so even if some day the coins move, we will not know if someone made a successful quantum attack on satoshi's keys, or is satoshi him/her/itself moving coins.
AFAIK, Quantum computing compromises the ECDSA part of Bitcoin. Public keys are sent only when a transaction is initiated. Hence, a transaction is needed from that address to compromise the private key if Quantum computing becomes a reality. I believe satoshi has barely moved most of his early coins (except the one to Hal Finney). There isn't a definite way to tell if anyone else was mining alongside satoshi.