CompTIA updated their renewal policy reversing their earlier statements. You can read about it here.
If you're certified now or certify sometime in 2010, your certification will be good for life just as it's been in the past. However, if you get certified in A+, Network+, or Security+ on January 1, 2011 or later the certification will be good for three years from the date you get certified.
Certifications that expire can be updated by earning continuing education credits. Expect CompTIA to announce details of the continuing education program sometime before January 1, 2011.