If I recall one of his previous tweets it was: "wouldn't it be cool if you only needed cubic ninja the first time you install ninjhax ? if you think so, stay tuned ( ͡° ͜ʖ ͡°)"That's what I'm hoping for too.
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He didn't mention anywhere that Ironfall is related to the feehax hack though it could be.
So it's a safe assumption we will still need Cubic Ninja at least the first time the exploit is activated.