Yes, the larger version of the 3DS, the 3DS XL, has long since been released.
No the 3DS has never been hacked to my knowledge.
It will come out on the 3DS and the WiiU but there has been no release date yet.
The 3DS does not have an instant messenger function. 3DS Letter Box was the closest application to that, but it has since been discontinued.
There already has been one. It was the legend of zelda 3ds.
It has been announced that there will be a Sonic the Hedgehog game for the Nintendo 3DS, though no details have been given.
Starfox 64 3D has already been released for the 3DS
This question is somewhat pointless now that the 3DS has been released, but yes, you may be able to get a store to hold a 3DS for you for pickup.
You will have to perform a system update, then yes, it does (as long as you have a wireless connection that the 3DS can connect to).
Nothing has been said about releasing a green Nintendo 3DS anywhere.
because it is downloading things to your 3DS! n you can buy things
Yes, the 3DS XL has already been released in all regions