Adventure Time: The Secret of the Nameless Kingdom which ran in HENkaku via VitaShell, and now Tokyo Xanadu is rumored to be the first decrypted PS Vita 3.60 Firmware VPK game backup!
Download: xanadu.zip (2.28 GB) / PS Vita PKGs
To quote from Wololo: "A download link for the Japanese version of the game appeared on Chinese forums a few hours ago, and apparently the game runs on Hacked Vitas through HENkaku.
The file is big (more than 2GB), and according to the author of the release, VitaShell is not able to install it. However, manually unzipping the vpk file and copying the files at the right location on the memory card allows people to run the game, DRM free."
Thanks to @Ensight, @Fimo and @Chaos Kid in the PSXHAX Shoutbox for the news and download links