"Does this imply that he thinks the ALP may be defeated and then he will come back as the saviour?"
I don't think so.
There is an interesting article on the front page of the Sydney Morning Herald, titled " A year on, Rudd would do things differently". In that article, he was quoted "he conceded the validity of the criticism that he had surrounded himself with whiz-kids but no experienced staff in the inner sanctum of the prime minister's office".
That goes a long way to explain my observation, expressed several times in my posts in the past few months, of how Labor had so badly managed its ascendancy over the coalition and allowed it to lose that edge in such a big way, and the government's failure to communicate effectively with the community its policies and their implementation. Its biggest failure, in my view, was not to explain wholesomely what it had done to cushion Australia from the ravages of the GFC, to allow the opposition to get away with its big debts rhetoric.
These are the failings which have harmed Labor very badly. It seems to me that the same failings are besetting the Gillard government.
I do think Rudd will do it differently this time if he has another chance to lead his party and the government before the next election.