as of right now, no
Currently, as of this moment, no.
there is a demo section in the eShop and you can also use the search
No, but they will come out with one :)
you can't. But you can get a demo on nintendo dogs + cats on 3DS
No there was not ever a demo for the game
The game will say you can't play it anymore and will give you a link to see what the full version is about. It also gives you a decision whether to delete the demo or not.
Here: http://3dsmaxtrial.autodesk.com/3dsmax2008trial/Autodesk3dsMax2008_ESD_Trial.exe
Yes, they will cost money unless it is a demo or a limited time event
You can get the free demo, although that isn't the full game.
What ever
Sorry to break it to you, but there is absolutely no such thing as a DSi 3DS, nor will there ever be.
Minecraft is not available on Nintendo 3DS, and there are no plans for it to ever appear on the platform.