I'm worried as I have not seen a single orange piece with an Aug slot. Admittedly, I've only made 5-6 myself, but have not crit on a single one. I've also scanned the AH, and not seen any.
With out the chance of an Aug slot, orange gear will be left behind in the end, which makes me sad. I hope this is not the case, but I haven't seen any solid proof one way or the other.