Naughty dog basically confirms last of us 2

[phaedruss]

fireburn95 said:

They're hardly going to say we've written out what we want for future stories, or something along those lines, because instead of 95% sure we'll be hundred percent sure.

Plus Bruce and Neil started working on the last of us a few months before Uncharted 3 shipped, they've now dedicated to a sort of two-team studio, so one set of people will need something to do.

After tlou shipped, there's about 8/9 month gap between then and when amy hennig left. So while bruce and neil weren't directly involved in u4, they had to do something, and that likely was jot down ideas and inspiration for the next game.
Trust me, the basic story of tlou2 is written by now.

They jotted down ideas or wrote the whole story? Which one?