We've added a new Membership Details page recently to the account page here:
https://www.cakewalk.com/my-account/membership This should help clear up any confusion about your membership end date. Looks like the answer has already been given in this thread, but if you purchased SONAR on 1/22/15, you'll receive any updates that are released through 1/22/16, plus even a little extra time during the grace period that's in place. So technically, you would really receive updates through 2/7/16 if my math serves me correctly.
Hopefully this helps!