u/Agreeable-Two1370

Given what wutangdan has already confirmed in terms of numbers on mock lineup posters, this is my best guess at confirmed artists:

Going through both lineups for overlaps:
1    Tame Impala — headliner on both
2    Parcels
3    Four Tet 
4    The Avalanches
5    Fatboy Slim 
6    Darkside
7    DJ Shadow
8    Cobrah
9    Joost
10    Robyn
11    Zara Larsson
12    Tomora
13    Daphni
14    Marlon Hoffstadt
15    Mind Enterprises