Wanted to give a little update on this (in case anybody cares).
I did get the notice to extend my Greencard by 48 months in my USCIS online portal today, and I can see on the letter it does in fact have my new address so I expect it will show up in the mail before the end of the week, if not, next week.
The quick processing would have worked out alright for me in this instance if they hadn't updated my address, as I'm still under a lease for the old apartment through April.
Thye also sent another notice letting me know that they can re-use my old biometrics and I won't need to attend another one, which is nice.
Now I'll just wait until next year when I can file my N-400.
Onwards!