Well the new package is here, what are your first impressions?
1) Horribly complicated, now playing ANY class is much much more complex than even 3e.
Maybe now the simplest character is the Wizard... because to play a Cleric I have to learn the mechanics for managing cantrips, spells, rituals, channeling, combat expertise, skill dice, and making a lot of mandatory changes just at character creation time.
2) Damage bloat, it was fantastic to have Deadly Strike as a Fighter. In 35+ years they never managed to give the Fighter an edge, now they had something perfect: plenty of tactical choices if you want, straight bigger damage if you don't. They should have stopped there.
Now everyone except the Wizard has that, plus even some flat bonus at higher level just to make sure that everybody's HP will need to inflate accordingly in next packets.
3) Wizard spellcasting changes, a step away from traditional D&D. Since this is a default and not an option, this does not please those who hate traditional D&D, but rather pleases those who hate people who like traditional D&D.
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These are a pity, because otherwise the packet is sprinkled with good stuff, innovative ideas... classes have ENORMOUS FLEXIBILITY. Now this is a GOOD thing, but only if you can afford to invest a lot of time mastering the game. Everybody else, beginners, casual gamers, parents who struggle to find one free night per month for gaming (these are pretty much the types in our group), should really look to some other game, because when all this flexibility is MANDATORY, there is no way we are going to play this edition.