Reenie and Melia, glad I could help both of you, albeit for different reasons.
As for the episodic model, I feel that way about TellTale now, as their episodes have gotten so short. It hardly feels worth it to just play for an hour and a half, so I will probably wait to play their next two games when they're finished.
Chapters is different for me though, for two reasons. One, I am far more impatient since it's my favorite game series.
Secondly, if the first episode is anything to go by, they are much meatier than the average episode, even compared with TellTale's old model, so I feel I'm getting a lot more out of the experience. So for those who choose to wait, look at it this way - at least you'll get quite a sizable game when it's out in full.
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As for the controls, you can use wasd, or you can use the arrow keys, which is my preference. I didn't know this, but apparently, you can also hold down the right mouse button to walk and both buttons to run, using the mouse as a camera, which may actually be the preference for the average adventure gamer. I just tried it out, and it's actually really fluid. Also, even with the keyboard option, I found it a lot easier to use the mouse as a camera as I moved the character(s). That way, you're not dealing with Zoe or Kian moving in a direction you may not want them to. 