Paul,
Are these "special shells" a part of the special effects you spoke of earlier that are expected to be used by the Canadian team?
As for the display in Sherbrooke tomorrow evening by Pyro Spectaculars, I look forward to seeing the video of it, but if you're heading that way, be sure to have your umbrella handy as steady rains could develop, and possibly strong thunderstorms will be widely distributed across Southern Quebec and Ontario throughout the entire day tomorrow.
Apart from all this, I really look forward to seeing how Canada will represent the Northern Lights - this should be one of the most interesting performances.

Since Canada is one of the few countries that commonly sees the Aurora Borealis phenomenon during the equinox periods, I have a feeling this is one reason as to why the team got the inspiration to do such an exquisite approach. Go Canada!
Trav.
