"Pangu Team released the iOS 8.3 Jailbreak for 1st time at the Shanghai Mobile Security Conference in China. However still it hasn't released for public untill iOS 8.4 version release. However, you will be able to
jailbreak iOS 8.4 also with the Pangu tools
."
--http://pangu8.com/83.html
Looks like we are waiting until 8.4 is gonna be released