SCL Contents and Tempo

Has SCL superceded what used to be in the various "optional" channels (can't remember the long channel-name strings Red Hat used, but I think CentOS referred to them as "fasttrack"and "contrib")?

Are there plans to make a broader set of tools available? If so, how does one get access to relevant road-maps?

How frequently are components in SCL updated? I was looking at SCL 2.x release notes and
- The nginx version was 1.8 - the current "stable" version is 1.10 and the "mainline" version is 1.11
- The MySQL version is 5.6 while the downloads from the MySQL community site is 5.7.x
- (insert similar degrees of lag in the (few) other packages in SCL)

Basically, I've got tenants asking me "why can't we get off the company Satellite" and I have to tell them "it's not in the mainline or supplementary channels (and our IA policies generally preclude tenants from installing from project tarballs).