Mine was expiring next year too and I just got the new one so I can get a full year when I go in January for the next extension.
It took a couple of weeks to get back after sending it. They return your new passport, the old passport(punched), and a letter for immigration to transfer the stamps to the new passport.
You have to go to immigration with all 3 to get the stamps transfered over to the new passport. Plus the next 90 day report will have to be done in offce or by mail. The online will not work the first time because of the new passport number.