As I posted earlier the surprise announcement isn't a wildcard. According to a show insider it's this:-
Simon's going to announce that he's Michael McIntyre's real father (a bit like Skywalker & Darth Vader).
He was conceived when Simon met Dawn French at a party & she laced his Babycham with Rohypnol & viagra & raped him.
Michael will respond with a beaming smile & "I love it" as that's how he responds to everything. THe Hoff will get confused & think Simon's talking about him & start spouting nonsense before realising no-one actually listens to anything he says. Amanda will just sit there, cackle & give a resounding yes to a passing fly being put through to the final.
Simon's then going to serenade Dec with Whitney's, "I will always love you" before declaring his undying love for him & asking him to elope then & there.
When Dec rejects his advances Simon will run out crying like a big jessie & call Louis Walsh to come & pick him up in his gold-plaited Robin Reliant with pink interior.
Louis will take him home to Ryan Seacrest & they'll all live together on an island somewhere in a weird menage a trois never to be seen again.
Its true. A senior Syco exec told me
Or I suppose it could be a wildcard