This new feature was mentioned recently by Valve and the publisher and developer pages on Steam are now live.
Steam users can now follow their favourite developers or publishers to find out what they are up to and also all their games currently available. All their games are also categorised by type on the left side of the page.
This new feature looks similar to the Curator pages but this way you can keep track of upcoming releases as well as discounts. I am not sure how handy this will be unless you a real fan of a particular developer or publisher but at least the option is there now.
If you head to the new page now it will offer a few suggestions to get you started.