Nintendo announced at San Diego Comic Con that a retail version of eShop titles NES Remix 1 and 2 will be released in North America. NES Remix Pack (pictured above) was released at retail in Japan earlier this year for a price of about $28 in US dollars, so we can likely expect a similar price point in the States.
Well, I doubt SNES Remix would be such a quick turn around anyway since it requires a new engine in a way NES Remix 2 didn't. So yea, probably won't come out until 2015 (if it exists at all).
But if it weren't for that I think it's possible Nintendo could release both around the same time, with SNES Remix as a download title, since I think they see eShop games and physical games as having different audiences. But that's just a guess.