Okay, so randomly I decided to make yet another list. Given my previous post about series that haven't had a song on the website yet, I figured, for the heck of it, I would look at what series haven't had a song on the website yet, and then what things we currently do know about new music for them
Series with no new songs played and their numbers in the direct aren't larger than what they've had throughout Smash:
Game And Watch, Final Fantasy, Bayonetta.
Series with No new song played and numbers not shown in direct:
Mother/Earthbound, Kid Icarus, Wario, Punch Out, Xenoblade
Star Fox: no new song played. Direct listed 17 songs which is 2 more than series ever had across Smash. Also, Song in direct labelled as "Star Wolf" in 64 section of star fox with no remix icon could mean the original 64 theme which has never been exactly used (I've heard a suggestion it could be assault's which has been used, but Metroid seemingly is listing the samus return's remix of lower norfair separate from super metroid; hence I think a franchise's own remixes are listed by said remix's origin, not the original song's origin, so a direct port of star wolf in the 64 section is 64's version. If this is the case, than that means there could be only 1 unknown star fox song)
Pokemon: new sun and moon trainer remix in direct. No number shown
Sonic: No new song played, at least two never used before songs based on direct numbers (20 vs smash 4's 14 plus 4 that were only in brawl)
Wii Fit: New training menu remix, direct shows at least four more songs than smash 4 (10 vs 6) so plus new remix means at least 3 unknown.
Special/Weird to talk about ones:
Smash: We do have the new smash theme on website, not any remixes of older smash tunes if that could mean anything (given melee battlefield on 4's website)
Spinoff Mario: we already have a main mario theme on the website, no spinoff theme there (and spinoffs seem to be a seperate category based on direct). We've heard a new luigi's mansion remix and Classic Tennis in character videos and trailer.
Ice Climbers and Rob: No new songs we've heard or saw in direct or website, plus are under "other" which has a song on website
Duck Hunt: does have a new song in character video, not on website. it's listed under "other" which has already had a song.
Pac-man/Namco thing: no new pac-man song played yet and none on website, but direct lists 13 which is 10 more than smash 4's pac-man songs. New Namco song was given the "other" icon on website, but if it's still counted as a part of pac-man and all other namco songs from smash 4 are counted for it as well, then minimum amount of unknown is 2.
Other: we've had two songs labelled as such on website, more could go up for it (Namco one special as said above though.) If perhaps 3rd party songs won't go under "other" for any reason (sort of a random personal thought), maybe rathalos theme goes to mega man or street fighter cause Capcom?
Any unrevealed franchises.
(One thing that should perhaps be noted; It seems likely not every old song returns, so simply just comparing numbers won't give an absolute indication of how many new ones are in. It just suggests what could be the bare minimum of "new in Smash." Also, how technically we might not know if the numbers seen in direct are 100% guaranteed to be all there is or if there's potential for a bowser jr. floatilla situation (song appeared in his smash 4 trailer but not the game), however for now it seems safe to assume these trailer songs will be in and the numbers are final)