Just read about this in cricinfo. Apparently he's to announce his future within the next 24-48 hours.
As an Australian, I've always appreciated Hussein's tenacity, and particularly his willingness to call it as he saw it, and not let his career be "controlled" by his detractors. He managed to quit the English captaincy (no mean feat, really), because he was unhappy about how the team had been treated over their concerns with touring Zimbabwe, and now it seems like he'll end his career right at a point when his place in the team, so often attacked (stupidly, IMO) has been so very well vindicated.
If he does retire, good luck to the man. He'll always have my respect.