Everybody says indeed that JCAB medical examinations are quite "out of this world". They keep you for two days, it's more expensive than a 4 hr sim-check and it makes you feel like they're going to strap you in a rocket and hire you as a space monkey !
Now for the JALways contract in particular, a friend of mine applied and he was told that a few guys were hired but JAL didn't find a slot for their training, so they're still waiting and maybe they'll start in August.
But that's old news, it might have changed since...