It's the best and most recognizable title from the 3DS launch. If they shipped 1mill WW, then I'm sure the sell through is pretty good too (What else are people gonna buy for 3DS at the moment?). If Capcom is just now reporting that they shipped 1 million then that means they have already gotten a restock order which means that the game is obviously selling.
We won't have solid US #'s till Thursday (NPD) and who knows when or if EUR #'s ever show up, but Capcom having got the order from retailers to ship them 1million units is a good sign for future Capcom fighters on the 3DS.
So I am not the one that is confused as to how "shipped" vs "sold" works nor did I feel the need to point it out as if everyone else didn't either.