I am not FMG, but I can pretty much guarantee they will be hard plastic like A&A - otherwise detail in the pieces would pretty much be impossible to see!
Guys, lets be honest about Canada - even making a couple pieces would cost a few thousand dollars, and really you would end up with the exact same UK/India/ANZAC pieces.
As powers in Axis & Allies, we already have:
Russia
Germany
UK
India
ANZAC
Japan
China
US
Italy
France
That is a HUGE investment, in terms of money and time to make pieces. If FMG makes all those, and they sell out succesfully (a big if!), then maybe additional countries could be made. However, if new units will be made, most probably it should be a neutral set, with a pro-axis and a pro-allied neutrals and they would probably include some “cast-off” or “early-war” units, such as Panzer II’s for Spain/Portugal etc, and T-26’s for Mongolia/Turkey etc.
After those have been made, perhaps FMG can make some pieces for Canada - there are a couple ways they could do this, one is by selecting a few pieces from the UK/US selections and just molding them in different colors, or they could make a couple unique land pieces and mold those in a new color. In any case, I do think it will make sense for FMG to do a “Canadian” unique infantry eventually - but much patience will be necessary!