Contact rate is improved, but not an unsustainable, Astudillian rate. Doubles and triples power will always be there as long as he can put the ball in play since he's so fast. He's still not walking enough. In short, this is a version of Byron Buxton which is:

a)plausibly sustainable
b)has room for growth
c)is, right today, extremely valuable

Also, I want to just get this out right now in case Astudillo somehow bats .350 all season while rotating "pretty good" defense (it's too early to understand that's the case statistically, but he's looked solid everywhere) all over the field, including regular stints at catcher, then we need to figure out a way to make a "WAR doesn't understand Astudillo" MVP case for him. I mean, ignoring that Mike Trout exists.