This is according to reports in which based on Nintendo UK’s website, there seems to be a copyright that mentions SNK Corporation. This has led to speculation that the upcoming Challenger Pack 4 could contain characters from SNK games. However, there have also been some reports to suggest that maybe this might not be the case, at least according to a post on Reddit.
For those who have been gaming long enough, SNK is probably a name familiar to you. The company is probably best known for their games such as Metal Slug and King of Fighters, which means that should this speculation end up being correct, perhaps we might see characters from those games make their way into Super Smash Bros. UItimate.
Nintendo has been rumored to be hosting a Nintendo Direct conference in the near future, so we expect that they will probably reveal more details about this upcoming DLC then.