"It is now possible to configure the number of concurrent requests served by each of your app's dynamic instances ..."

Wow! This is huge!

I wonder if other platforms (Java, PHP, Python) will also get this. Go is wickedly fast, starting up and instance as well as serving a request. And now that an instance scales to much more concurrent requests it even scales fantastically. Awesome.

EDIT I just saw in the documentation that Java can do this as well! Our main business runs Java on App Engine and I never heard about this ... odd.