You can eventually...it is an option they are hoping to add in the near future, though as of right now this isn't possible.
However renewing annual passes has just become easier. Just go to a ticket window to renew, and your current annual pass is "recharged." No more getting a new photo/card...unless your old one is wore out or something! Saves a lot of time!!!
I just did mine over the phone because I won't be back until June. You keep the same cards. Only took a few minutes. Call them up, give them the 6 digit number of your card(s), they pull up the info, you give them a CC#, expiration, they run it, say you're all done.