That is a very good question and one that hasn't been answered yet... There has been many things said and nothing definitive. How the XPs will work and I agree that it is super important... My guess is they are very focused on how to deliver it and learning a lot from everything they are doing right now. I doubt they will start the tournaments without it being answered, so I think you have less than 30 days for that answer.

My guess is they will do it and limit it to games played during SM sanctioned tourneys. They might even tier it based on the level of tournament played too... (ie the big teams get more xp than the little ones)... that's just my guess, but I think they are well aware that people are expecting XP from the cards and they developed the cards with the XP to be given in mind.