At the very least the stock seems to be held back, since I haven't seen any stores in the US come back into stock for a couple weeks now. Canon hasn't made it very clear at all what they are doing with stock and shipments.
And to all those "this is not an issue at all", do you imagine how bold is the decision to hold off selling your hottest product for two weeks, and maybe more? They will never do this unless it is a SERIOUS ISSUE. I am sure that they are working hard to avoid a re-call by all means. Personally i will not wait until my return window expires, mine is going back tomorrow. I'll pretend that the launch date has been postponed till June/July.
No, it has become a serious issue because of idiots on forums making it a serious attack on Canon's reputation. Of course they have to answer the customer-base, even if they are wrong, so as avoid bad press.
Having said that, Canon PR got it wrong this time. Instead of acknowledging the apparent issue and holding back stock (which may actually be for repackaging with new DPP and Firmware updates for Eye-Fi), they should have downplayed it as something that occurs outside of the designed specifications, thus not an issue for concerned parties.
As for the video MrSandman posted, non of us are privy to their testing conditions or the settings being used. In addition, to my eyes at least, the "correctly" exposed image appears over-exposed to me and the "light-leaked" image more what I'd expect or want for that scene. Regardless, the user is probably shooting sub 1EV, so shouldn't be using the inbuilt meter anyway.