If you have been waiting around for the next update to Super Smash Bros. for Wii U and 3DS, you can expect it sometime this month.
Nintendo of Japan (via NintendoLife) revealed that update 1.1.6 would weigh in at about 61 MB for Wii U and 325 MB for the 3DS. They are a bit large for just tweaks and bug fixes, so it is assumed that there may be some character balancing going on as well.
The patch will be required to play the game online, and will be incompatible with any previous replays, so be sure to backup the game before installing any update.
Patch 1.1.5, whcih came out in March, included a rather large laundry list of changes to various characters.