I think that this was definitely an interesting move on Pokemon's part. For starters, Nobunaga's Ambition is a game that is not on America's market, for what I can tell, and, if it is, it's not very well known. Plus, in America's market, there isn't much place for turn-based RPG's of that style, with the fast-paced of the likes of Call of Duty, Halo, Skyrim, and other quick games. Now, I know that this game is coming out in Japan, so the logical question is, "why am I bringing America into this, it's a Japanese game?". Well, because America is a huge part of Pokemon's market. So, deciding to pair with a game practically unheard of in America might not have been Japan's smartest move (although, I will admit that pairing it with some of America's popular games may not be the best idea… "Quick! Use the AK-47 on that Magikarp!" doesn't sound too good…)
I also question their idea to release it for the DS, rather than the 3DS, or even for the Wii, it seems like it would be a good fit for a console game, "on multiple gaming platforms in Japan," as Pokebeach itself quotes it. To which I'd presume meant at least one main console game. With the game seeming so "out of date," it might not do so well, if maybe it had, say, a 3D logo on it. I find Nintendo's backtracking a little interesting. Maybe we'll have a definite reason in the future. And, if what Starboard Driger said is true, then this will truly be something to watch and see what Nintendo's plans are.
However, the idea of Pokemon in the feudal, more natural state of ancient Japan is an interesting allure, to say the least. Seeing Pokemon as more of an "adult" (for lack of a better word) game is quite the concept. And, despite my inner self screaming with every voice in my body that this won't go far, sell well, etc., I can see myself buying this game, if it ever hits American shelves. As my first paragraph stated, it is certainly a bold move towards the American market, so they may just decide to keep in Japan, and never export it oversees. However, I don't think there has been a major Pokemon game (although we have yet to see how "major" that this really is…) kept from America, so my fingers are crossed. Even though the choice of game seems a little off to me, I will be picking this up and, until then, following it's mysterious release every step of the way.
And, at 0:54 in the second video, does that look like Giratina to anybody? Or is it just me?