I almost squealed when I saw Revlon Whimsical at Superstore the other day! I'm so surprised Canada got it so quickly, we're usually way behind the US.
I've been looking at comparison's of DL Glitter in the Air, and they are super close. The main thing I see is that Whimsical's base is a bit more blue and GITA seems a bit grey.
I used Sephora Havana Dream as my base for Whimsical. I will definately be trying other colors for Whimsical, I can't ever imagine being tired of this polish!