I hope I was one of the ones confused by the video; why would you spend a bunch of time showing renders of a design you haven't done? That makes no sense whatsoever. I thought they were going 1 for 3. (On the chance that this is a proposed design for the plaza or the reclad; if your design is indistinguishable from a placeholder, you're bad at design.)
The expansion? I like it, some. The exterior looks great; innovative and contemporary without looking stupid. I think it'll frame the plaza well.
The theatre? I'm a little worried from these renders. It looks like it's trying to be all things to all people -- thrust, in-the-round, proscenium, etc. -- without being good at any of them. In a standard proscenium layout, there are three areas, it seems:
The area on the floor near the stage is flat, so sightlines aren't great and you have to hope that the person in front of you has a small head and doesn't like to take pictures with their phone. It also likely means uncomfortable movable seating. This is a good configuration for (as shown here) a band where people might get up and dance, but not as good for theatre, classical music, dance, National Geographic presentations -- you know, the stuff that's in Arts Commons. The balcony is raked (ie slanted), so the sightlines are better, but you're a long ways, maybe 20 rows or so, from the stage. The side balconies mean you're likely to be turned in your seat for the whole show; they really remind me of the boxes in an old opera house -- and the point of sitting in the boxes was not to see, but to be seen.
The other rendering shows an in-the-round configuration with the performance in the middle, which would be really good with this design. But the problem is that this layout is rarely used. For one thing, any touring production will assume a standard (proscenium) stage configuration since that's the most common layout available and you need to do the same show in Boise last week, Calgary tonight and Edmonton tomorrow. And for another, in-the-round is just tough for a lot of shows; you can't really have scenery since it'll block somebody's sightline, costume changes are hard since you can't duck into the wings; it's hard to block action so it's interesting to look at from all angles. It can be done -- the Shakespeare Company did a fantastic Macbeth in-the-round a few years ago -- but it's just tough.
Just as a reference check for folks about theatre sizes; 1000 seats is large, it's bigger than the Max Bell (Theatre Calgary) which is ~800. It's smaller than the Jack Singer (CPO concerts) at 1700 and the Jube at 2500; about the same capacity as the Mac Hall Ballroom*, although this multilevel structure will be better for shows than the big-barn approach. The 200 seat studio theatre is about the size of the Big Secret (OYR) or the Engineered Air theatre; Vertigo also has a ~200 seat black box studio, and Folk Fest's Festival Hall in Inglewood is 200 or so as well. Vertigo's main theatre and the Martha Cohen (ATP) are in the 400 seat range.
*the large concert venue on the lower level, not the old ballroom on the 3rd floor. I wanted to call it 'new' and realized it's now about 25 years old.