I can confirm that I have been able to replicate this
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So the question, why did the need for E-TTL, with the pre-flash system come about? In what situation does E-TTL work, where TTL does not?
E-TTL2 works in the ambient light, calculating the correct exposure by comparing the scene with just ambient & ambient+pre-flash, plus it takes the subject distance as reported by the lens into account. The result is an ingenious system where you can nail most exposures in varying light and distance and set the subject/ambient ratio with a turn of a dial.
Canon USA has a link posted for April 30th. I'm waiting at least until then, they still might be tweaking it.