I would have thought you would be fine as long as you don't live in a part of the world with a
very high ambient air temp. And/or a case with very poor cooling / air flow. And don't have a tendency to run countless hour of strees tests like Furmark. I shall certainly continue to use mine. But I do live in a pretty cold part of the world and have a decent Liam-Li (aluminum) case with excellent cooling / air flow. Plus I'm running a fairly aggressive custom fan curve via Afterburner (sensible if it's overclocked, like mine is)
I believe there will be instructions posted up by EVGA some time next week. So that people can have a look to see if they are comfortable with applying the "optional" additional thermal pads. I'm sure it wont be long after that, before a vid appears on YouTube showing a strip down and how to apply etc.
One thing EVGA could do with stating though. Is what happens if someone inadvertently damages their card while trying to apply the thermal pads? Accidents do happen after all!