Following the marketing blitz with interest.
Shifting front and rear more or less together is doable according to one first-ride reviewer, you press both paddles to shift the front then let off one paddle which shifts the rear.
One comment many first-ride reviewers make is that the shift speed feels slower than di2 or mechanical. I keep waiting for a reviewer to point out what seems like the obvious reason for this. Since pressing both paddles at once shifts the front, a very fast response speed to pressing a single paddle would lead to unintentional shifts if you mean to press both paddles at once but instead press one very slightly before the other.
In any case I hope the system turns out to be great, options and innovation are always good.