Not quite.Soon (TM). The capture cards will work with all models of 3ds (not sure about 2d) when they're available.
Old 3DS regular: Getting stock soon
Old 3DS XL: Dead
2DS: Dead
New 3DS regular: Capture card for this is a tad too big at the moment
New 3DS XL: This is the new, non-Katsukity product, coming out from 1-3 months as of January 2016.