Star Alliance are in negotiations with Bombardier as we speak.
The reason is to negotiate the purchase of a rather sizeable order for a mixed bag of RJs (900/700/200) for 'member' airlines.
Something about their purchasing power....versus the individual members. They're also looking at a common configuration.
Air Canada as a Star Alliance member stands to benefit from the order as it is likely to receive a number of them to operate. (In the Star Alliance paint scheme) Something to do with their present 'financial state'.
So, it's unlikely the Embraer will show up anytime soon.
Having been around the industry for a number of years, "anything's possible", amigo!
Willie