E3 leaks related to Nintendo are fairly rare and if there is a leak, it's about an individual game or hardware, which would get an official confirmation by Nintendo a day or two later.
But an entire list of Nintendo's E3 games would NEVER leak out this easily. Compared to Microsoft (and Sony to an extent), Nintendo can be ridiculously good at keeping leaks from happening.
Yeah, Nintendo had a problem a few years ago where legit information kept leaking like it does with Microsoft, but I guess they plugged that leak and now it doesn't happen anymore.
The things that make me question this list are:
A Star Fox game releasing for 3DS. Nintendo said the Star Fox 64 remake was being used as a test and if it sold well, future Star Fox titles would be considered. That game didn't sell well.
A demo being available for Zelda. Nintendo has already said that they are showing off Zelda, but they usually don't do demos until a game is close to release. If this game is coming out next year, I doubt they would be demoing it this early.
Bringing back Wave Race: Blue Storm seems like a weird move when they have other games that would sell better as HD remakes.
But no Majora's Mask Remake 