Well, I tried.

I tried to see if the Smash Bros. posters would still be available in February, but this doesn't give us much.

(18:17:13) Alexandra C said to you:
Hello!  This is Alexandra C from Nintendo Chat Support.  What can I help you with today?
(18:17:35) You said to Alexandra C:
Hello. I wanted to ask a short question about Club Nintendo.
(18:17:43) Alexandra C said to you:
Certainly!
(18:19:07) You said to Alexandra C:
You may know there are the Smash Bros. poster sets up on Club Nintendo right now, and I wanted to ask if the posters will still be up in February, because of the new limited quanity physicals rewards coming then.
(18:20:06) Alexandra C said to you:
I'm not sure of any plans to discontinue the poster sets, but I do know that we have a limited number of them, so if you want one I would recommend ordering it sooner rather than later!
(18:21:01) You said to Alexandra C:
Okay! I have about 900 coins, so I wanted to know if I should save them for the new rewards in February.
(18:21:53) Alexandra C said to you:
Ah, I see. Unfortunately, I don't have enough information be able to guide you one way or another.
(18:22:04) You said to Alexandra C:
Okay.
(18:22:15) Alexandra C said to you:
Sorry I couldn't be more help, Cameron!
(18:22:21) Alexandra C said to you:
Is there anything else I can do for you today?
(18:23:02) You said to Alexandra C:
Not at the moment, but could you just say what type of prizes will be in February? Like a type of item, posters, etc.?
(18:23:38) Alexandra C said to you:
Even we here at Nintendo haven't gotten any information about that yet!
(18:24:17) You said to Alexandra C:
Okay. Thank you for the answers on my questions today!
(18:24:23) Alexandra C said to you:
I imagine that as soon as it comes out, it will be announced on the Club Nintendo website. No problem!
(18:24:27) Alexandra C said to you:
I’m glad that we were able to chat today.  If you have additional questions or concerns, don’t hesitate to contact one of our phone agents at 1-800-255-3700 or visit support.nintendo.com. Thanks for using Nintendo Chat Support.