This is a great step forward. The extra 15% will make the difference between survival or not for a lot of small/solo developers.
Valve next, please.
Valve next, please.
Valve will eventually align themselves though, this is what happens in an healthy market.
This alone puts Steam on the map of many gamers interested in indie games.
But now Apple has weakened the case that 30% is industry standard, so hopefully they'll budge. And I think you're right that they'll eventually align.
It's unfortunate that Valve could have easily been a leader on this front. Now they'll be a late follower at best.