X-Pro1/X-E1 & The New Muffin Lens

Has any one tried new XC15-45 PZ lens on an X-Pro1 or an X-E1 yet? I read the owners manual for the lens and it says it may or may not work with older bodies without firmware update, then links to current firmware. It does not say the lens will wok or not work on old X-series bodies. I would like to try on X-Pro1, but afraid it could brick camera. I never had to update firmware on a camera body any time Canon or Nikon would release a new lens model, so I do not understand why this is issue...

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