Those 3D Classics from Sega couldn't stay in Japan forever. The publisher's line of enhanced eShop titles has been confirmed for release in North America and Europe and will become available soon. Always with the "soon." Here's the lineup:
For as many ports of these as I own, screw it, what's the harm in one more purchase?
'SEGA 3D Classic Series' Coming to Nintendo 3DS [Sega -- Thanks, Adam]