http://www.nintendo.co.jp/3ds/axcj/update/index.html
So apparently a new patch is coming. While most of it is pretty standard stuff we expected (use Google Translate, I'll post something below in a sec), apparently replays and stuff won't work as before, possibly meaning balancing could occur as well.
Edit: Here's my edit of what Google Translate gave me:
Ver. 1.0.5 [2015.2.10 Delivery
amiibo Support to New Nintendo 3DS / New 3DS XL.
If touch amiibo on the touch screen, you can become a "figure player (FP)", you will appear as a rival and partner.
※ If you already have FP that are growing in "Super Smash Bros. for Wii U" is, the game can accept amiibo "Super Smash Bros. for Nintendo 3DS."
※ Customers with Nintendo 3DS / 3DS XL playing this software, you need to download the update data delivery plan after its release and peripheral devices of summer will be released in 2015. Please wait a while now.
the "shared" mode was added.
"Photo", "Replay", to post to a dedicated server; "Mii Fighter" and can be shared with users around the world. It is also possible to locate and download submitted data.
※ Your post is limited to the data that you have created yourself. Post data will be deleted from the server after 30 days.
"Photo", "Replay", you will be able to send the "Mii Fighter" to friend.
※ acknowledgment is done when it is connected from this software to the Internet. (No idea what this means)
※ You may take a long time to receive. (Again, what? Maybe Mii Fighter crap?)
※[Something] will be deleted from the server if it is not received within 30 days.
It is now possible to post to Miiverse using the "Photo" option from within the game.
※ It will be posted on a dedicated community "photo sharing room".
Other, so who can play comfortably the game was fixed some of the problems.
※ If you download the update data (Ver.1.0.5), and those who use the update data (Ver.1.0.4) previously you will not be able to play against others via local communication.
The replay data that you saved in updating data (Ver.1.0.4) previously you will not be able to play.
※ In order to perform the Internet play, the update data (Ver. 1.0.5) will be required.
Hopefully that is accurate. If it's not, soz
Discuss.