I have built an app and submitted it to the AppStore. When upgrading to Yosemite I decided I would do a complete refresh of my macbook.
Now I don't have access to the provisioning profile I originally uploaded my app for review with.
The app has been sent back with some iPhone 6 issues.
Am I going to be able to re-upload the app with a new provisioning profile?
Yes.
You will have to regenerate your App Store provisioning profile with your new key in order for you to Archive the app, but as long as you have a valid provisioning profile for the App Store and a valid key in your keychain maching the one in the app store provisioning profile you'r good to go.