Per Reddit
http://www.reddit.com/r/jailbreak/comments/2knte0/tetherme_for_ios8_available_for_beta_testing/
http://www.reddit.com/r/jailbreak/comments/2knte0/tetherme_for_ios8_available_for_beta_testing/
If this applies you will see a package named "TetherMe for IOS8+" when you add repo.tetherme.net
This is the same thing submitted to live, but it's taking a while to post so I wanted to figure out how to give you impatient people some access...
Also be sure that your device is linked to your Cydia account in "Cydia -> Manage Account -> Installable Purchases" or you won't see anything either.
Thanks sbingner, got it working and already tested works 100% fine. iPhone 6 iOS 8.1
For those with crashes to home screen what I did was before opening I turned on Override Data Source and checked the IPSec/openvpn clicked on the Personal Hotspot and didn't crashed...and then I turned Override data source OFF...hope it works for you guys,