For those just joining us, u/ZekiraDrake pointed out that the numbers correspond to pokedex numbers meaning the three new pokemon referenced in these new files are Darkrai (491), Scizor (212), and Empoleon (395). I should point out that the batlseq archive doesn't contain all information about all fighters, but rather seems to contain supplemental files for various fighters and support pokemon. Character models and textures are located in content/WiiU/packdata/chrdep/master/, where no new files have appeared. If these files really do indicate that there will be new fighters, they will be completely seperate downloads when released (as opposed to the way sm4sh handles DLC, which is essentially just a small file that "unlocks" the new characters already included in the game update). This is interesting because it implies that those without the DLC will not be able to fight against DLC fighters online.

Also, we can rule out the files with 10453 as being significant in terms of DLC, as these are likely files for Croagunk (various pokemon forms in the game are often associated with increments of 100, like Pikachu Libre having files with 10025 and Charizard's mega form being labelled as depp006_100 in his character archive).

Again, the btlseq archive is for supplemental files - not all pokemon have a file in here. Given that there is space for four additional fighters on the CSS, there may be one more surprise fighter we don't know about yet. If we don't see any DLC announcements during Nintendo's E3 streams, it may be something we'll see at Evo.

TL;DR: New files in Pokken suggest Darkrai, Scizor, and Empoleon may be incoming DLC fighters - There could potentially be a fourth fighter too we don't know about yet

Bandai Namco will release a major update for the arcade version of Pokken Tournament on July 20 that will add a new playable Pokemon, the company teased.

The new playable Pokemon yet to be announced, but will be fully revealed during a Niconico live stream on July 14.