So my faucets showed up a day early and here are my initial impressions:
At a glance they are identical to the old style Ventmatics - they look good on the wall with the others, almost can't tell which ones the new ones are.
However, when you look at them from the side, you can tell which ones are the new style because the handle tilts back a few degrees further when closed (and they open a few degrees further as well).
Here is a closeup side by side - old on the left, new on the right
The faucet spout that came with the new one is a 10mm where my old ones came with 12mm. I confirmed that spouts are interchangeable between bodies.
Here are the guts laid out - again old on the left, new on the right. There are some differences in the bonnet washers and orings and they do not appear to be interchangeable, but I have not tested. Also the old body style let you insert the handle lever in any orientation, but the new style does not (you can see the milling difference is you look at the full res picture). There are also some minor differences between the slide valves.
Finally, the interior... they look identical but there is a better polish on the internal body on the old style... again need to see the full res to see the difference.
I haven't poured from them yet, but all in all, for ~$35 a piece I am very pleased. I have no doubt that these will perform just as well as the old ones.