Nintendo said that they are not excluding any IPs from Smart Phone games so we can be expecting to see many familiar faces!

Of course Mario, Pokemon, Zelda and such are a given :)

At the moment 17 billion dollars, before the announcement it was around a market cap of like 11 billion. Though the stock has been going down, and it is now just 27% up instead of 31%

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I don't see why so many people are surprised by the mobile announcement, maybe because of how soon it happened? Iwata did say in the past that they were planning on creating apps to bring attention to Nintendo games:

Q: The market for smartphone games continues to expand. What are your plans for this category?

A: In the past, I have opposed making smartphone and tablet versions of Nintendo titles. Prices for content aimed at smartphones and tablets are falling quickly. I am still wary of the category. We intend to develop products that will allow customers to identify with Nintendo products and make people pay attention to Nintendo games.

http://nintendoeverything.com/satoru-iwatas-thoughts-on-2015-and-the-future-wii-u-sales-and-smartphones/

While Nikkei claimed before that, that Nintendo was bringing small demos/minigames as apps to work as advertizement for their consoles, which is pretty much what Iwata said a year later, and look at that, it turned out be true.

http://nintendoeverything.com/nikkei-claims-nintendo-will-announce-demos-and-ads-for-smartphonestablets-this-week/

Stuff like Pokemon Trozei-Shuffle would do great on mobile.

Simple touch based minigames like the ones in Super Mario 64 DS are simple addictive games that would work great, that's what I expect Nintendo to do, not big complex games like Animal Crossing as plenty of people are saying more simple stuff.

Hey, it'd be a great time to reintroduce Tetris attack.

It comes as a surprise because Nintendo, for the longest time, said that they would not be going into the mobile sector...

Them saying that they would make apps for the smartphones does not equate to having demos/snippets (like Capcom's AA demos), let alone creating actual games for mobile. Many people, myself included, assumed that these 'apps' would be something that would track data or something from the game, such as a Mario Kart 8 app that allows you to see records and such, or an actual Miiverse App.

Though they said that they won't directly port any games, I'm expecting to see Shuffle and Trozei being 'ported' for iOS/android

I may be wrong, but I don't think that Nintendo owns Tetris... (I think it was Ubisoft?)

They could just release it under the name Pokemon Puzzle League or whatever.

Despite its name, Tetris Attack is very different from Tetris, I doubt Tetris Holdings has any ownership on it.

But in recent times, they began to see ways to utilize the mobile market in their favor.

That wouldn't exactly help with what Iwata wanted of the apps to make people pay attention to Nintendo games, a majority of people will not know what the Mario Kart TV app is, they will just pass it over as just being something about watching Mario Kart videos, BUT if you put small minigames/small game experiences as apps in mobiles that is a whole different story, that would bring attention, and may lead people to Nintendo's consoles.

I know the general idea of why Nintendo is moving to the mobile sector, but the suddeness comes as a surprise. They just recently released the n3DS so, in a sense, it seems like they are not fully supporting their handhelds because now they will begin to spend resources for producing games for mobile as well. Don't get me wrong, I'm not saying that they are not supporting the handhelds, but it just seems too soon.

Of course, they can make a lot of money and raise awareness by moving games and their popular IPs to the mobile games but this doesn't necessarily mean that more people will buy a Wii U/3DS or their new console...

Imo, I don't really think that Nintendo is expecting sales for their consoles to rise. Instead, I think that Nintendo is moving into this market pernamently while (hopefully) still producing consoles/handhelds and games that go with it. That way, they have another source of revenue, not as much as an advertising scheme.

One great thing about Nintendo doing mobile games is that it will reintroduce these IPs to millions of people and it could result in them wanting more. It's essentially one big advertisement for Nintendo, and in an age where they aren't too good showing off their products, this is huge.

Yeah it could mean that, but it could also backfire and lower Wii U / 3DS sales, because people already got what they wanted.

They really need to be careful what they put on there.