PowerIQ 2.0 outputs up to 19.5 W vs 18 W has same compatibility. The former is only more powerful than latter.
You will see more PowerPort II with Power Delivery chargers in the next 6 months.
Apple just replaced their 29W adapter with a 30W version. I wonder if they saw this post.
Thanks for the 1 extra watt
What I was really wondering is why it is not reflected in the specs:
5V 3A, 9V 2A, 12V 1.5A
...which still suggests 18W.
That is a long time to wait.... What about more PowerCore with Power Delivery portable chargers?