The December 5-issued Lioness: Hidden Treasures includes 12 tracks.
These take in recordings from before the release of first album, Frank, up to music she was working on this year.
While it will technically be her third album, Island Records co-president Ted Cockle was quick to point out Lioness is not in any way the planned follow-up to 2006's Back To Black.
He noted: "This is a true reflection of the different stages of Amy's career."
The new set includes a cover of The Girl From Ipanema dating from 2002, a 2008 recording of a song called Like Smoke featuring a rap from Nas, and a new Winehouse original, Between The Cheats - which was a potential cut on her third album.
"She was hip-hop. She was doo-wop. She was high. She was low. She was all right. She wasn't all right and I think this encapsulates everything," said Island co-president Darcus Beese, who signed Winehouse to the record company.
Winehouse's long-time collaborator Salaam Remi, who produced eight of the album's 12 cuts, was not anticipating a slew of further releases.
"It's not a 2Pac situation," he said, referring to the late rapper whose release output post-death far outweighs what was issued while he was still alive. "There are more [unreleased] pieces, but the majority of what was going forward [for the third album] was written but not recorded."
Remi said the tracks for Lioness were already largely completed before he worked on them, while he was confident anything he did add would have met her approval.
"I had constant discussions with her all along [her career]. I was the musical safe house for her," he said.
The decision to release Lioness so soon after Winehouse's death was partly determined by her father Mitch, Island's Cockle revealed - whom he noted wanted to progress with the Amy Winehouse Foundation.
A donation of £1 from the sale of each LP will go to the Foundation, which helps young people - especially those needing help because of ill health, disability, financial disadvantage or addiction.
LIONESS: TRACK BY TRACK
Our Day Will Come
Salaam Remi revealed during recording with Winehouse they would often "play around" with cover versions of songs, with one such session producing this reggae reworking of Ruby & the Romantics' doo-wop cut
Between The Cheats
"One of the songs slated for her forthcoming album we were working on," according to Remi, who said Winehouse typically recorded this in one take
Remi explained this slowed-down version existed prior to the up tempo Back To Black recording, sampling Marvin Gaye and Tammi Terrell's Ain't No Mountain High Enough
Wake Up Alone
Previously unissued from the Back To Black sessions and recorded by Paul O'Duffy
Will You Love Me Tomorrow
A 2004 Mark Ronson-produced cover of the Goffin & King classic
A slower version of Winehouse's celebrated Zutons cover
This features rapper Nas, name-checked by Winehouse on Me & Mr Jones and "one of her favourites", says Remi
The Girl From Ipanema
When Winehouse played this to Remi in May 2002 - when they first met - it convinced him she was musically something extremely special
Remi said this was part of the original repertoire of songs Winehouse played for him when they met in 2002 and, while it did not ultimately make the first album, "She mentioned Sinatra in the song and that's one of the reasons that album was called Frank"
Remi-produced 2003 recording dating from around Frank
Body & Soul
Her last-ever recording and the sole album cut already available - it is also part of Tony Bennett's Duets II album
A Song For You
This cover of the Leon Russell song was recorded by Winehouse in her home studio in St Lucia into a hand-held mic as she learnt Donny Hathaway's version from her computer