As I understand the treaty through looking at the government materials and the treaty itself, Canada did have a free trade agreement with Ukraine before this modernized treaty was proposed. As I understand it, the big change would be in the area of services, which were not covered in the original FTA. There is a typical Canadian model for services opening, the service market access chapter. Then there's the integration of the investment treaty into this modernized deal.
There are some quite positive elements on labour. The labour protections are much better than in past Canadian trade agreements. There's some interesting stuff on procurement.
My understanding is that this was largely a way to bring the past trade agreement more in line with Canada's comprehensive trade agreements with respect to services, coverage, financial services and that kind of thing.