"There is a some conditions to fulfill to become a CPS member. I think you need at least 2 5D or 1D bodies and 3+ L lenses... Also, you need to prove that photography is you main income job I think. So yes, Canon expect that you send a portfolio, etc."
Canon changed to a "points" system instead of a purely equipment based system, at least in the US. Each piece carries a point value, so it's actually much easier to qualify than it used to be, although if you were a true working pro before, the minimum equipment required to qualify wasn't really that much. At least in the US, there is no portfolio requirement, either, but it is intended for professional photographers. It's not just for still photogs anymore, which is part of the reason they changed to a points based system, to include support for video as well. The base level CPS membership(Silver) is free again(10 points), but the preferred treatment for the 1DX goes to Platinum members($500 annual fee/50 points).