The holograms are the product of a years-long project, designed in partnership with a special effects company of Star Wars creator George Lucas.
Repeatedly delayed by technical difficulties, then by the Covid-19 pandemic, they will finally be unveiled in May.
The group initially dreamed up the idea of avatars, and then the music followed suit.
By 2018, ABBA had confirmed rumours of their return to the studio and that at least two new songs were being recorded.
But great pains were taken to keep the music a secret.
"First it was just two songs, and then we said: 'Well maybe we should do a few others', what do you say girls and they said 'Yeah'," Benny Andersson, 74, explained when the album was announced.
"Then I asked them 'why don't we do a full album?'," he added.
He and Bjorn Ulvaeus, 76, have been promoting the album in recent weeks, with 71-year-old Agnetha Faltskog and Anni-Frid Lyngstad, 75, opting to spare themselves from busy promotion schedules.
All promotion was halted for 24 hours this week after two people died at a tribute concert north of Stockholm on Tuesday evening.
In addition to the two songs released in September, a third track from the album was published in October, a modernised version of "Just A Notion", originally recorded in 1978 but never before released.
The newly released songs cannot escape being compared to hits like "Waterloo", "Dancing Queen", "Mamma Mia", "The Winner Takes It All" and "Money, Money, Money", but the band members are not worried about disappointing fans.
"We don't have to prove anything, what does it matter if people think we were better before?" Andersson told Swedish daily Dagens Nyheter.
TID's warning to arbantone singers about using his songs