My thoughts thus far:
1. Removing the attack cards was a good decision, albeit one that sort of hurts the symmetry of all the Innovation expansions (as there'll be 5 fewer cards in this set). Ah well...
2. The simplification of the draw rules for Cities is extremely interesting and fits a nice niche that hasn't yet been exploited (melding new colors, and splaying). My only problem is the 'meld action for a new color' will only happen a few times while the splay one will happen multiple times. With the old draw rules, it seemed like both rules would come up consistently. Not saying this is a bad thing, but this asymmetric draw rule will be interesting to look at in the future (it certainly makes Clothing a little less powerful since you aren't drawing Cities when you run it).
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I really like the 'meld a new color' rule, and the splay rule. Perhaps we can add on to the 'meld a new color' rule to also include when you Meld a card for an Age that's not already on your top board (e.g. all your cards are Age 1, you take a Meld action to put down an Age 3 card... this means you'll only have one Age 3 card on top, so you get an Age 3 city).
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3. Endorse is a very interesting change. It shares the same tucking action as before, but the ability to dogma something twice in a row will be very, very interesting to see play out. Not sure if the added complexity of not sharing the second time is necessary, but it keeps explaining Cities to new players a lot simpler.
4. Just as before, having lots of Cities on top does very little to things you can do during your turn. With these changes, you won't be drawing as many cities as before (unless you have a way of splaying things, or have good dogmas that also splay).
5. The change to drawing base cards when you meld a city is cool. It certainly adds a lot more strategy to how you want to deal with the Cities you draw (most likely, with the benefits of drawing X cards = age, you'll want to Meld that city).