Can I update my Jailbroken iphone to iOS 8?

Without restoring my iphone, can I update ota with the jailbreak still on the phone?

Put your iPhone in DFU mode and iTunes will detect and update to ios8, just check YouTube on how to put iPhone into DFU mode, if jail-broken never go to general and reset otherwise you will be stuck into apple infinite loop. If not in a hurry wait with jailbreak till Christmas until new JB arrives.

No. You have to reset your Iphone to get the new iOS, because the Jailbreak is only compatible with the iOS version you jailbroke it with.

No you will have to restore and update. You can always backup and restore from backup on the new iOS

Yes, you can. It will just overwrite your jailbreak ios

I think you can

Just don't wait for the jailbreak of the IOS 8 please