Here is the video announcement
In the video :
They said it includes 6 new songs + Platonic Planet + a new recorded version of "GIRLS BE AMBITIOUS" (with new lyrics), and a sexy song recorded by the 4 adult members and a cute song recorded by the younger members.
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In the H!P site description :
It contains 24 songs in total, including the 12 singles from "Bitansan" to the latest single "Plastic Love," 4 Additional Tracks, 2 newly recorded songs, and 6 new songs.
Limited Edition A with Blu-ray (Music Video & SPOT Collection + Making-of jacket photo shoot) + 8P photo booklet + Digipak specification, tall case size.
Limited Edition B with Blu-ray (Music Video Another Ver. Collection) + 8P photo booklet + digipak specification, tall case size.
and Normal Edition.
All Editions include
CD Disc 1 : The Best Juice 2019-2022
CD Disc 2 : The Brand-New Juice 2022
http://www.helloproject.com/release/detail/HKCN-50712/
I guess it's a Best Album and a New Album together.