If you held a pre-signed transaction that sends the funds back to you with a lockTime of 1 Jan 2013 that would work.
I've been out of the loop for a while.. Does lockTime work correctly nowadays? If not, when is it scheduled to be implemented?
nLocktime has ever worked since it was introduced.
What doesn't exist yet is transaction replacement (which is necessary for many, but not all, of nLocktime's applications). Thankfully, implementing transaction replacement doesn't need any protocol change or fork or miner support.