Sony has this special perk for buying a PS3 game and giving away the PS Vita counter-part for free if it exists. It's called the "cross-buy" initiative, and it seems like Nintendo somehow thought about having a similar feature for the 3DS and Wii U devices.
According to Nintendo business development licensing manager Dan Adelman, the cross-buy idea has been "talked about", but will require demand from developers to push through.
"We don’t have anything new to announce on that, but I believe that the idea’s been talked about. So it’s something we’re definitely up to considering if there’s enough demand from developers, but nothing to announce for right now."Source: Nintendo World Report