Maybe not what we all thought...
A lot of us haven't actually been reading these articles, especially the second one and have been angrily posting our thoughts. I will admit that I myself am also guilty of this, but today I actually took a look at what these rumours had to say, particularly related to the the 2nd WCCFTech link.
Looking more closely at these rumours (links on the first page) it may just be that the handheld system and not the home console would be using an Nvidia Tegra chip. Which would make much more sense. There's a few folks out there who think AMD Polaris for the home console for sure, and Nvidia Tegra for the handheld is a possibility.
As for the cross-platform features,
one guy discusses and goes into detail about the differences in architecture and what it could mean for the rumoured cross-play features. I don't think the cross play thing is likely, as much as I want it to actually happen, but going for an ARM architecture for the handheld makes sense.
I won't get my hopes up though, even if Nvidia supply chips, Nintendo could still make a severely underpowered handheld once again.
Edit: Looks like there's a divide between the 'rumour-mongers'. The XB1-level performance seems to be supported by some chick called Emily Rogers (never heard of this person) and some other folk (the guy mentioned in the video I have heard of, he got 'rumour' videos taken down by Nintendo in the past for who knows what reasons) have been arguing against it. This is one reason why I hate rumours.
This video is a neutral party just laying out what each side claims.