All I have to say about the open and glassless concept is the employees are going to hate that. No glass means no A/C! It looks pretty though...
But on paper at least... Wow.
That is something I dislike about the layout of AK. As soon as you enter park the path splits into a "Y" and there are animal exhibits. People tend to stop in their tracks with their strollers and things get blocked solid.
Granted, I have not been this year to experience Manta - so perhaps the park feels less...barren and half-dayish than it did when I was there a couple of years ago?