Are ALL 3DS games going to be download-only?

All the revealed games so far are said to be "downloaded" from the store. Does that mean that Nintendo is no longer going to sell games at stores and just sell them on the Online DS Store?

Or is it just certain games?

where are you getting any of this from? I believed it was going to use cartridges again?

If you could provide a source for that information because I have not heard anything about that. Based on what we've heard/seen and people have suggested pre-E3, most of the game should be on cartridge not download. A few games (like remakes) may be downloads, but any new titles are likely going to be physical like they always do.

Input/Output:
A port that accepts both Nintendo 3DS game cards and game cards for the Nintendo DS™ family of systems, an SD memory card slot, an AC adapter connector, a charging cradle terminal and a stereo headphone output jack.

http://e3.nintendo.com/3ds/

Dunno, just may be or use your own DS games.