It reintroduced the Mega Evolution mechanic but made it function more like traditional evolution rather than have it trigger with the use of a Spirit Link tool card
A good place to start would be with Goblin Rabblemaster or Brimaz, King of Oreskos tokens, or possibly the new Bloodsoaked Champion
It also has cool little cartoons/sketches showing potential matchups between decks as if it was a real Pokemon battle
With more than 25,000 people already jumping on it, I would not sit on this too long
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I dont know that its worth the risk in a lot of Casual decks, but once you get to that hyper-optimized ground, I think its significantly better and a real house