ABBA stars Björn Ulvaeus and Benny Andersson arrive in London yesterday ahead of the band’s comeback launch.
Björn, 76, and Benny, 74, have not performed with Agnetha Fältskog, 71, and Anni-Frid Lyngstad, 75, since 1982.
But fans can watch them announce stage show ABBA Voyage plus new music on their official YouTube channel at 5.45pm.
A source said: “Björn and Benny landed in London as a surprise for fans at the event and on the live stream.
“They will be revealing all about the new music and their stage show.”
The Sun revealed the group were making their comeback last week, 39 years after they announced their hiatus in 1982.