I'm really looking forward to seeing Aura as well.
While the 4 Season's is a quality building, ultimately its not the skyscraper that will define our skyline(i.e. considered a landmark that people outside of Toronto will immediately recognize) as I feel its constrained by its form. Aura on the other hand does have that potential and not because of sometime so primitive as its height(yes that is nice too), but due to its a unique design.
From the off set ovals on the upper portion to the change in form and set back half way up all the way down to the well integrated based. Perhaps most importantly its all glass and no box (the lower portion may be 4 sided but its certainly not a box). The glass looks to be a pleasant metallic blue with no green tinge - the Ritz's shortcoming and lets not forget that a curtain wall will be used.
The naysayers are quick to write off Graziani + Corazza based on their past history. Before Aura I had no keen interested in any of their designs. But once they came out with this refreshing design they certainly had my attention. Perhaps people are being cautious before endorsing this one, but I have a feeling they'll be pleasantly surprised.
Ultimately I feel that Aura and the L tower, are going to be the defining skyscrapers of the current boom.