They have been tweaking it. Before the glass back was curved and ran along the building horizontally. Now the pattern is more vertical. I actually kind of liked the older wavy version myself.
Edit: Didn't catch that we had spilled onto a second page and were moving onto a second new rendering. Looks like the new project could be interesting and there is certainly room to redesign Doyle Street... but if they're not going to save and respect the stone front of the BMO there is no way I can support it. The BMO is a beautiful building, is irreplacable and should be retained. Modern could work alongside it. After all, the Second Cup bit/Rogues Roost is already tacked on and BMO has made some tasteless changes to it (doors and signs). So I really hope that around the corner from that round tower lies the old stone front. To lose the whole thing would be a huge loss to the city.
Photo by me in winter from a few years back