When a domain expires, the registrant has a "grace period" in which they may renew it (at regular price) without penalty. IIRC, this is ~30-45 days.
After this, it goes into a "redemption period" (I don't remember how long this is) where it is basically in limbo. I believe that some/most registrars will still allow you to regain control of the domain during this stage, although at a MUCH higher cost.
Eventually, the redemption period is over and there is a short period (5-7 days?) before the domain is finally released and available for registration by anyone.
FWIW, I just looked up a .net domain (these timelines sometimes vary by TLD) I had that expired 27-Oct-2013. It is currently still in the "redemption period". Same thing for a .org domain that expired on 28-Oct-2013.
I wouldn't expect for the domain to be released and available for you to purchase any earlier than 1-Feb-2014.