That's not real.
You know why? Well, first, because if that was real...it would be my favorite handheld ever. Period. Not even for the resolution. Not even for the bigger screen. Not even for On-TV play. Those would be great, but what would easily be the greatest thing to happen to the 3DS for me is the reversible top-screen. Ever since I first played a game that either didn't use or didn't require one screen or the other I'd wanted that as a thing, but I kept it to myself largely because it would be superfluous and difficult to design around.
But...well, that's not really a reason. There's the fact that it's an E3 2015 thing, the Gamecube support and "30 years of gaming" idea doesn't really gel with how the company's been going about Virtual Console, and it's far too progressive (and thin, when you think about it). It really feels like the 3DS if it were the Vita. It just seems unrealistic in a lot of ways, especially for Nintendo.
It's cool, though. I wouldn't mind that being a real thing. Not at all.