LastPass is first out of the gate with LastPass for iOS 8 with Browser Plug in Support! AWESOME!
And 1Password for iOS is currently FREE, and we know they will also have iOS 8 Plug In Support soon.
Leaving only SplashID with only an iOS 8 iOS app in the works, but no mention of plug in support.
So far LastPass has taken the lead by releasing the morning before iOS 8. Still think I may try out 1Password and see how well it takes my SplashID data though.