Based on that article and a couple of pages it links to, I have to think Ontario players will only be able to reach those sites if the site operators are licensed to run:
Quote:
...private gaming operators that have registered with the AGCO and have executed an operating agreement with iGO can begin offering their games to players in Ontario.
Not only that, it seems like all sites – old and new – would be ring-fenced. i.e. if you're on PokerStars, it would be an Ontario-specific player pool. You know better than I do how many people that entails, but I guess you can be thankful it's not the AGCPEI.