After towards a good chance that iOS 8 was jailbreakable, famous hacker Stefan Esser (nickname i0n1c), tweeted an image that shows off the ability to SSH into an iPod touch running iOS 8 from his Mac, which basically means he has successfully jailbroken iOS 8 on iPod Touch 5G.
I just leave this here …
There is no information whether i0n1c will release a public jailbreak. Anyway, It would be logical to wait until iOS 8 is officially released so as to not burn any exploits.