Also I think the only games where Nintendo has not announced the official title are new instalments the wouldn't be any need for that for a port so it's looking like a new title possibly built on the same engine like what XBC2 was.

It's safe to say Smash wont be using the free update strategy a.k.a. releasing the game while it's still being developed, thus my Mario Kart example is the better comparison. Of course not the whole studio, but it obviously means the game is gonna take longer to make without the aforementioned shortcuts.

Great to hear. I assumed it was new. That is not a way you introduce a port/deluxe. That was new game trailer.

Add onto that the above quote from Sakura on Twitter, as well as teh bottom right saying "new game by hal" when trailer ends. 

Sakurai said something on Twitter about this?! That changes things....

Well you can bet that this Smash Bros will be huge and very popular in any case.

They already have a game engine so why is 4 years too short? XBC2 reused an engine and made new assets for a new game in 3 with half the team.

I know those were not in-game assets, but the art-style and general vibe look different from Smash 4.

If they don't tweak the mechanics and use an updated version of the Smash 4 engine I could see it being a new game. Really what it needs is single-player story like Subspace emissary.

A straight port with just some new characters and skins would be really underwhelming, especially since the Wii U version already ran at 1080P and 60FPS, so there isn't any room to upgrade the performance like Mario Kart 8 had.

I think Mario's model in the teaser is from Odyssey by the looks of it.

Well, I was on the "no way this is a new game" bandwagon, but I think everything seems to point out to a new Smash game.

its bad I'm more excited about future guest character announcement hype trailers than the actual game itself