Every pack plainswalker would be a little overkill but I can see from the spoiler list so far that there are some rare planeswalkers.. they are generally mythics.
I havent played Brawl, we usually do 1 on 1, 2 matches at a time.. it takes hours for 3 matches each.. and usually uses the whole afternoon.
The set looks good, Ill keep an eye on it.