If this turns out 100% and releases, props to Canon for the extended support. It's a huge show of faith supporting older products, especially with an extravagant release like this, and should be a long running trend. My hats off, things like this will keep my arse firmly parked as a Canon fan.
While it's of topic, I think to take this logic a step further, Canon should simply open their firmware to those daring enough to mess with things under the hood. Even if they stipulate that it breaks warranty or some such, which is I'm sure specifically a big reason why they don't want to do this as that would be hard to track if a firmware hack broke something physically and then the original firmware was flashed back, it's still just the cooler thing to do and I think in general, a much bigger positive for all of photography on the whole compared to that minor downside of occasional bricked cameras.