While rumours are circulating that this announcement will see the return of French duo Daft Punk, the far more likely candidate seems to be Pink Floyd co-founder Roger Waters, given that the musician has just announced a massive show at Hyde Park next summer for BST festival.

Consider, too, the visuals of Aiken's announcement:

pic.twitter.com/CEoEQ6itFs

— Aiken Promotions (@aikenpromotions) October 3, 2017

And the visuals from Roger Waters current 'Us and Them' tour:

As part of the UK tour, we are coming to London’s @BSTHydePark on
Friday 6th July 2018. On sale 9am Friday 6th. #usandthemtour #rogerwaters pic.twitter.com/bUYitiJWqr

— Roger Waters (@rogerwaters) October 2, 2017

Roger Waters builds the pyramid from "Darkside of the Moon" with lasers during "Brain Damage." #PinkFloyd #RogerWaters pic.twitter.com/CCVZhWymU8

— David J. Criblez (@DavidJCriblez) September 16, 2017

Roger Waters show Dark Side of the Moon pyramid! Wow!! pic.twitter.com/BedcYurVJ9

— Jeff Pellegrom (@JeffreyDavidDog) July 27, 2017

Roger Waters in Cleveland. "Eclipse" gave me goosies ? Yes, that's a laser 3D prism pyramid; to the left, a floating orb! ? #UsAndThemTour pic.twitter.com/wNnVKFuKA4

— Ian Saint (@SaintsRearview) September 23, 2017

The most obvious location for such a concert would be the Aviva Stadium (Billy Joel was just announced a few days ago) and it is likely that the concert will take place in early summer.
If it is Waters, he’ll be performing classics from Pink Floyd’s The Dark Side Of The Moon, The Wall, Animals and Wish You Were Here, along with new material from his Is This The Life We Really Want? solo album.