Tested a few of my favorite tweaks and can confirm the following jailbreak tweaks/apps work with iOS 8.4 despite not being labeled as such. I personally tested the following:
- Better 5 Icon Dock
- Adblocker 2
Update:iDownloadblog has come through not long after writing this with a full spreadsheet
The author of Activator dropped a beta for iOS 8.4, so dependent apps can be installed.
It took a full restore before I was able to jailbreak with Taig, but after that, it went smoothly. I’d hold off on installing any music related tweaks, but most iOS 8.3 jailbreaks seem to be working.