Booster is all clan from what I hear.

I heard this as well.

I'm not sold on it being so slow, half of the mechanics are about bluffing on attack and defense, deciding when to outlast seems a difficult choice.
Most creatures with an high toughness have 0/1 power, so they might as well not exist(except the tapper and the zombie ape) , a bunch of power or an activated ability.
But I haven't yet played it.
Morph doesn't flip into something enourmous until you have 5 mana, so it's probably better to attack with your big morph the turn you flip it, than keeping the mana open for preparing an ambush

It's time for me to do something I do more than I'd like to: admit that I'm wrong. Khans is really cool. The mechanics lead to some really difficult decision trees, with lots of ways to spend your mana on any given turn. I think this is really a high-skill format.

I agree it's very high skill. Maybe too high for me, I am going to get repeated creamed by more experienced players (or else I will draft bears.dec and hope they miss land drops)

I think the morph+wedge is a very clever development mix. I think the clan abilities are a bit forced and awkward for draft... except Raid, that one is pretty nice.

What I found interesting is that I had a bunch of morphs that cost 5 to flip and 6 to hard-cast. So I would often cast them on turn 4 and play a non-morph on 3. But then I realized that this is actually telegraphing a 5 mana flip and lands in hand.

This is an important thing for you to note: a creature that unmorphs for less than 5 will always die to something with two power. When you are facing down an attacking morph, look at their mana.

No, it won't. It will always fail to 'win' the combat (it won't live AND kill the 2/2 it blocks / is blocked by), but it often won't die. Monastery Flock won't die. Sage-Eye Harrier won't die. Sidisi's Pet won't die. Dragon's Eye Savants won't die.

Another clever thing is the way they promote wedges, but really nothing but the few three-color cards force you into a three-color deck. I think it will many times be optimal to build a two-color deck, with a heavy splash, or two light splashes.

My experience with the pre-release was the exact opposite. In the final round, of the top six tables, six players were Mardu aggro including me. When the final results were in after 6 rounds, the top four players were all Mardu. (took 4th) Raid was extremely effective for me and all the removal meant that my early drops kept getting through. My only loss on the night was to another Mardu player who had enough of the token makers that my removal was not as effective to controlling the board.

That's a fair point. Didn't think about a those, mostly because I didn't see them played at all against me except the Servants.