As a kit supplier that's supplying a current Championship club, I can tell you that we've got the 2018 shirts on sale now.
The RFL don't currently have a sponsor for either the Championship or League 1, and are apparently in talks with one now, but waiting around for that isn't an option for us (all be it we're a smaller company that ISC etc.)
They have provided us with the new logo's for both competitions, but could add a sponsor to them at some point. I was happy to proceed with what I had.
Supplying these clubs costs money and if you lose the pre-Christmas sales, you're behind the 8 ball straight away.