Because they want to know more but aren't in the circle of devs Nintendo deems worthy of early attention? Or because they want to bring a game and can't talk about it? combination of both?
Not sure. Maybe closer to the former though. Thomas Mahler addressed frustration with getting development kits from all hardware manufacturers but focused primarily on Nintendo likely because Nintendo is so historically awful at getting development kits out in a timely manner. Based on some rudimentary googling, Moon Studios has one game to its name which was acquired by Microsoft. That said, if the developer wanted to support NX, it'd have to make a brand new game. Moon Studios is an independent studio so I can see why it would want development kits sooner rather than later to get a new game out as soon as possible. It doesn't have the cash reserves to be sitting idly waiting for development kits to be sent out.
and the FFVII remake rumor for Big N is still alive huh?
For now. The person who leaked this (SuperMetalDave64 on The YouTube, trevelyan9999 on Neogaf) wasn't as sure about the authenticity of this rumor thus flat-out labeled it a rumor, not a leak. He stated the source for this rumor in particular was right about other things without giving specifics. Make of that what you will. For what it's worth, SMD64 had a different source verified by Neogaf mods and his leaks were right on the money regarding the new Pokemon game that was just announced. The Pokemon/Nintendo release schedule source was good though he did an arguably poor job of protecting the source's identity (no name, mentioned the source worked for Nintendo's marketing department).
He also didn't cross verify it without another source. He seems pretty new to this. Everyone has to start somewhere. Emily Rogers admittedly slept with a source to get some info. I'd say SMD64 has a long way to go. Not that he necessarily has to sleep with a dude to score some juicy info. Rather, he has to build up his credibility in order to be taken more seriously. I mean, if he wants to sleep with a dude for leaks, that's on him. Literally.
Ultimately, the verdict is out on Final Fantasy VII Remake/XV, and we probably won't know until E3 at the earliest because Nintendo would undoubtably push these games as part of its presentation. The thing to take away from this is that SuperMetalDave64 already leaked good info and he trusted this other source enough to post the Final Fantasy rumor. I'm not especially excited about either game, but they would be big for Nintendo.
also, do we know anything about the new Zelda for Wii U?
I think I remember hearing something about it being open world style play, w/ large areas like Xenoblade/WoW or something.
Very little. The horse will automatically avoid obstacles like trees. Link can vault off the horse and enter a bullet-time-esque slow down to shoot arrows. Link can use the sail cloth to glide off high platforms. You can place markers on the map and a light will appear there, making it easier to find. That's about it. There has been talk of providing a female Link option to play as (not Linkle from Hyrule Warriors) though Aonuma may have just been musing about that.
Another rumor: Namco Bandai is porting Super Smash Bros (most likely the Wii U version) to NX. It also has other games in the works. Not surprising considering Nintendo has collaborated with Namco Bandai a lot on Wii U. I'm not entirely sure about the source of this rumor, but I really wouldn't be surprised if this ended up being true. Nintendo wants in on the competitive gaming scene and a new Super Smash Bros. wouldn't be ready for a few years. Porting the game that just had its last set of DLC last month makes a lot of sense.