Get your NX rumors. NeoGaf user, 10k, was passed some info. He was holding onto it for a while, but got the okay not too long ago to post it by the mods there. My understanding is that his sources didn't want the attention, and Nintendo is apparently watching threads like that one. It seems like Nintendo is stupid serious about protecting NX secrets. Why anyone would risk their livelihood to leak sensitive info is beyond me? I'll take it though. Anyway, 10k split the info into tiers based on number of sources backed up the claims (e.g. Tier 1 = one source etc.).
Tier 4
1. NX is more powerful than PS4 "by a noticeable amount" from CPU to GPU to RAM. NX's CPU being more powerful than PS4's was previously mentioned much earlier in that NeoGaf thread by LCGeek.
2. Super Smash Bros. and Zelda Wii U remasters are 100% confirmed. Emily Rogers mentioned there were four ports/remasters. The other two are Super Mario Maker and Splatoon. Nintendo is struggling to transfer player data and doesn't want courses to be lost. It is also struggling to transfer player data for Splatoon, but also wants to make the game cross-compatible with Wii U players. 10k expects a screen in the NX controller though this seemed to be his own musings and not something his sources gave him. Read between the lines and that's the conclusion you should arrive at. If Nintendo wants NX and Wii U players to play Splatoon together, NX is going to need a version of the Gamepad.
Tier 2 (there was no Tier 3)
1. NX Non-Disclosure Agreements are extremely strict. No surprise. However, a source mentioned they know more Nintendo hardware people than software people yet they're being fed info from the software people. The hardware people aren't saying anything.
2. Nintendo is cracking down on leaks.
Tier 1
1. NX software development kits are out and developers have them.
2. NX is easy to port to. Apparently, developers are having no trouble porting current generation games over. It's a quick process and developers seem happy with it.
3. NX architecture is under NDA, but is speculated to be x86. 10k disagreed, but his source said porting from x86 to ARM (handheld to console) and x86 to x86 (PS4/One to NX) is easy while porting from x86 to ARM (console to handheld) is trickier. 10k gets a little technical from here, mentioning compiling and changing integers and recompiling. I'm not going to try to explain that. I just wanted to write out a summary since I have 10k's post on my phone (didn't want to attempt to copy and paste all of that) and I'm typing this out on my laptop.
4. A different source (a coder who works Nintendo) laughed off NeoGaf's focus on x86. 10k speculates that this source is alluding to the console also using ARM.
5. No one knows anything about the handheld. None of his sources or his sources' sources know if "NX" also refers to the handheld or if it has a different codename. The handheld is speculated to get some exclusive games, but it won't get many downported console games. The console could theoretically play all games. It sounds like a partially shared library. If I had to guess, I'd say Mario Kart is a game that would be a perfect shared title. It's a waste of resources to recreate assets for handheld and console. The Mario Kart team could instead focus on creating DLC packs instead developing Mario Kart 9 then starting over with Mario Kart 10.
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Anyway, I wouldn't be terribly surprised if NX was more powerful than PS4. It's launching mid-generation. I'm similarly not surprised by the four Wii U ports. Those are the ones I'd pick to start. A Mario Kart sequel could easily be ready in 2017 so no need to port MK8. If true, it's nice to know developers have SDKs and that NX is easy to port to. I still don't expect a ton of ports. Nintendo is going to have to work for third party support. Obviously, start with the big ones (e.g. Madden, Call of Duty) then work its way down.