Arena, but with a deck from the collection, as it was in the brawl several times. I would not want this, but this is unfortunately more likely than the two-headed mode or PvE. I hope I'm wrong.
Tournament mode with rules settings, possibly including intra-match. But it’s strange that it didn’t come out, since many people should participate in the test of this mode.
Or another attempt to spoof something trendy, but I do not follow this.
"Spell locked" - it also causes awe, but probably this is only part of the new game mode. I can’t believe that they will introduce social innovations (clans) or change the appearance of the collection of cards (more settings for the filter) - at least not before achievements.