If we summarize, I think we have all these rumours, some of them tagged as 100% reliable by different sources.
Rick Astley + Blossoms doing The Smiths - Fri Woodsies?
The Amazons - Sat BBC?
The Pretenders - Sat The Park?
Hozier - Sat Woodies? BBC?
DMAs - Fri Woodsies? Fri/Sun BBC?
Blossoms (already there, why not) - Fri/Sun BBC?
Fatboy Slim - Sun Greenpeace?
Plus other ones that I am not remembering anymore, but for main stages I think those are the suggestions we have today.