Doubt there will be an equivalent 'Arena' at launch, (since there wasn't one for Hearthstone either.)
However, some parts wouldn't, seemingly, be too difficult to bring over.
You could have matches where biting frost is constantly in play, where Siege units are not allowed at all, weathers change per turn.
These are things that will be in the story mode already (Or similar)
during pax they were asked about draft they did not know what it was so gwent will not have it Sad times.
If they really want gwent to be a e sport draft would have been added. this really hurts the game in my opinion we will see though.
Draft and Arena is basically the same concept, major difference is the entry fees vs rewards. It's just that HS is so popular, almost anybody who never played other card games will not have heard of Drafting. There's no question a similar game mode is already in the works for Gwent.when you have to explain the mode you are talking about
during pax they were asked about draft they did not know what it was so gwent will not have it Sad times.
If they really want gwent to be a e sport draft would have been added. this really hurts the game in my opinion we will see though.