It looks like we're in for a new patch for Smash 4 in January.
As pointed out on Twitter, there's a new notification in game detailing a few upcoming changes:
It's unclear at present if the patch will be a small one to make the above changes to Global Challenges and custom part drop rates, or if it will be another game balance patch. It had been speculated in the community that the last balance patch we recieved would be the last one for the game.
At present, pros like Zero have said that the Smash 4 metagame is in a perfect spot - so any change could upset the balance we've seen. On the other hand, many in the community feel that Cloud might be a tad on the overpowered side.