Is David Gilmour joing Roger Waters on his 'The Wall' tour?

[ManBearPig1]

I know Roger is touring starting in september but i heard David is also joining him? is this true?

 

[Raymond]

He said he would show up for one [undecided] show, and he will play guitar for 'Comfortably Numb,' that's all I read. So just one show of his choosing, and just 'Comfortably Numb.'