I'm betting it will be one of the dance acts - the producers always like to start the show with a upbeat act!
Which could mean it will be Cheeky Monkeys, Nemesis or Signiture - suspect they will keep George Sampson until later in the show!
Escala, Kate & Gin, Faryl, Andrew & George will be in the second part of the show imo - have a feeling it will be either Faryl or Escala who wins.