I think the Unearthed Arcana articles they are releasing for free should count as some new content.
http://dnd.wizards.com/articles/features/ and enter "Unearthed Arcana" in the search filter.
From those playtest documents we have
We have 5 new subclasses: Artificer, Spell Less Ranger, Favoured Soul, Swashbuckler, Stormborn
We have 4 new races/subraces: Warforged, Shifter, Changeling, and Minotaur
I know it isn't the same as buying a splatbook every month, but it's free and new content on a pretty regular basis, and more importantly to those who want physical books those articles are all playtest documents for future products so obviously they have some kind of plans for the future and new physical published material.
If I want bloat I play Pathfinder or 4e, I have done so for the past decade or so and honestly I am enjoying the trickle of new stuff for 5e compared to the flood of splat books from older editions.
I would still like some more progress on licensing for 3rd party officially sanctioned materials.