How Much Estimated will Splatoon Sell? (I ask because i like to know what is "not sell that great")

Well, Ninten seems to be actually marketing this thing. Like... a lot. And also it's fun. I find it to be really fun and addicting, personally. Maybe that's what's got people excited for it.

How many played Ico? How many people played Shadow of the Colossus? Some of my favorite games and yet they didn't do that well sales wise. Just because you played Splatoon and enjoyed it, does not mean many others will. Plenty of good games go unnoticed. Whether you played the game or not doesn't matter. What matters is mass appeal, and this game doesn't have it.

it is to shooters what mario kart is to racers

and due to the unique features i think we're going to experience some pretty dang awesome gameplay eg. hiding in the wall as a squid and jumping out and fragging someone in the back, stuff like that. the style is also very cool, it's reminiscent of jet grind radio

lastly, consider all of the gear.  never underestimate the addictiveness of amassing gear/loot.  i think the only downside will be the lack of maps/modes which is a good problem for a game to have - you want more of it

Here in Norway the game is at $37 if you buy it digitally and had downloaded the testfire (which gives you a discount).

The hype has gotten to me even though I haven't tried the game and I will buy it at launch. I'm itching to paint those walls.. :-O

You can say that about EVERY game EVER.

For example, why did people think The Order 1886 would sell well? Was a short, single player only, cinematic experience. Still managed to sell a reasonable 800k.

Yes it could be Nintendo fans hyping it up, but fans of every console hype up everything exclusive on their console of choice.

Also, it depends on your definition of selling well. Personally anything selling around 1mill is very well.

Splatoon: a 7 hour campaign, short. 5 maps, not enough. 2 game mods. 

Fat princess: 3.5 hours single player mode, 8 maps at launch, 6 multiplayer gamemodes. 

Both were unique games with a unique artstyle. 

Fat princess costed $15 when it came out.  Please tell me how these two aren't comparable? 

One of the very few games I pre-ordered. Can't wait to get it tomorrow from Amazon.

Well, as in over a million. Many people on this site seem to think that this is going to sell 2 million+, which I see as being incredibly unlikely. I think that splatoon will sell 600-800K. I'm not saying. I think the 1.2 million is the most this game could do. It's a new IP on a failing system. So, I'm not saying this game will flop, but I don't see it selling an amazing amount like how so many people on this site seem to think. 

Well, it has free DLC, good graphics, style, looks fun and is receiving A LOT of marketing from Nintendo in real life as well as hype on forums. It's also coming at a time without big competition. So it's natural to expect it to do well.