There is no reason why it could not include a shared currency. Quebec's proximity to America and the rest of Canada demands that there is some degree of compatibility between all three economies. We have seen models of shared currency among nations with varying levels of success, and it would be an issue that would have to be addressed in later stages of the movement. Personally, I believe that the entire world is going in the direction of a unified, inter-dependent economy. In many ways, we're already there, and a shared currency makes all of the sense in the world, but it is an issue that is ultimately up to the people.
This presents another problem. On the one hand, Quebec wants to separate, yet on the other it recognizes its need to maintain healthy friendships around the world and especially North America if it wishes to grow and prosper.
I'll take the issue of languages in Europe for a moment to illustrate my point.
A 1993 decree of the Italian Ministry of Public Instruction argued that if the Italian school system did not reform its second-language instruction policy soon, that English-language hegemony would soon cause irreparable damage to the integrity of the Italian language, possibly within a few generations at most. This in spite of the fact that Italy is an independent sovereign state surrounded by countries speaking various languages.
In 2005, the Grin Report, presented to the French government, made a similar conclusion concerning France's second-language education policy.
And yet both of those countries have far less anglocentric a policy than Quebec's, which essentially makes English compulsory in all schools across the province.
I don't see how the threat of English will disappear from Quebec just because of independence when France and Italy are struggling with the same issue and they're independent already.
If we consider that it is in fact totally in Quebec's hands to decide whether to make English compulsory in its education system or not (in fact a few provinces give numerous language options already besides French, with French being but one among multiple languages to choose from), and conclude that has therefore chosen not to execize this freedom, we can only conclude that the obstacles to weakening the grip of the English language in Quebec are beyond just legal, but have to do rather with Quebec genuinely not being able to see the options before it and so turn to sovereignty as a supposed solution.
Yet, if Quebec is already not exercising all the legal means at its disposal to weaken the grip of the English language in its province, why should we believe things would be any different if Quebec were sovereign?