I think that's half true. In the West it's to build hype for the upcoming game, while in Japan it's to capitalize on the success of the game that came out not too long ago. So Nintendo gets to have it both ways.
Hardly surprising. The first one was good, but then each entry in the series after that got successively worse and worse. It's a frickin' case study in sequelitis. Hell, this is the first I'm even hearing of this. Is this the 5th one or has the 5th one already come and gone without me noticing at all?
I don't know if this is necessarily something that will apply to your field, but this is a piece of advice my current boss gave me for interviews (I work at a tech industry staffing company, so we staff have to do job interviews with prospective clients to show them we actually know what we're doing). He said that when they ask a question to test your knowledge, you should try to give the most succinct yet complete answer you can within the first three seconds, then use the remaining time to elaborate and add further details until the interviewer stops you and moves on to the next question. Sort of like a spiral, starting from the center and working your way outward.