for that to happen everyone including the members of this site would need to truly believe it was dead and buried before Nintendo could start their unholy revival techniques on the body!

Maybe they're teaming up with Komani to bring Silent Hills to the Switch exclusively!

Not at all. MPT could very well be completed and done.

If Khan says it is, I am going to trust him on it because he's not really the one to spread rumors and hearsay unless he's confident in it.

If it's third party, Silent Hills and Shadow of the Eternals aren't bad guesses. If it's first party it could be a lot of things.

Castlevania

Given how friendly MS and Ninty have been with each other lately, it wouldn't surprise me at all to find that MS sold the IP to them.  Hell, I wouldn't be surprised to find that Ninty is handling development of a Scalebound project that will release on both Switch and Xbone.    

To be clear, I'm not predicting that the game is Scalebound related.  I'm just saying that I don't think it is outside of the realm of possibility.  

Chibi Robo or Custom Robo.

the "very officially cancelled" part should probably be added to the OP lol since a lot of people seemed to miss it, meaning it's not just gonna be from a series that hasn't seen an installment in a while, because none of those would have been officially announced to begin with, unless they had a past game announced then cancelled or something

it's a game that was very publicly in development and then publicly cancelled (for example stuff like Silent Hills, Scalebound, etc)

Ravenblade, Shadow of the Eternals, one of Factor 5's Wii projects.

https://www.google.com/

http://lmgtfy.com/?q=Ravenblade