I see 3 editions based on the current images offered [1] (not a fan of the terms, just looking at the web page):
* Base Cloud
* Atomic Host
* Docker Base
The current Cloud PRD [2] refers (in my reading) mainly to Base Cloud. This is where I think the discussion of removal of python sits. I think it's a balance between Req #1 of the PRD and Req #6 as well as sticking to the user stories, not building a new way users are required to use Fedora.
Building updated images as an *option* for folks who want to or have the processes in place to do "immutable servers" or other Ops patterns shouldn't preclude those who still want to run "dnf update" from using Fedora Base Cloud.
What Atomic is going to do re: faster 2 week releases starting w/ F22 b/c of speed of release of core software is separate. It adds to the confusion, certainly.
And I jumped the gun on SCL, I hadn't realized that proposal had been marked rejected after stalling on package reviews. I think Req #5 and the need for multiple stacks is the ideal argument for SCL.