For me if the changes and the information for their tutorials and web pages is updated to include changes, for example on the Raspian page, a link to the change log and links to their own blog post explaining these.
I have noticed they have been nicely and quickly updated for Pixel pictures and send what and gpiozero updates have altered some.
But the downloads have never had any link to what's been introduced, so you have to ask on search and trawl through why things don't work.
Like new setting in raspi-config, the uart Pi3 fun, that people may need to add a file to enable SSH...
So please add a link on Noobs to updates and bolg announcements (or for noobs to blog posts if you want to keep Raspian, though for many Noobs is the way to install Raspian.)
And keep the old links, as it's quite easy to go a lot of month never seeing the blog updates.