GATHER AROUND, MINECRAFT ADDICTS. KOMODOENSIS IS ON A NEWS SPREE ABOUT 1.9. WELL, NOT REALLY A NEWS "SPREE," JUST HE'S FOUND SOME COOL SHIT, AND NO ONE HAS MENTIONED IT YET.
So, after all these amazing natural structures implemented into 1.8, those being the Mines and Strongholds and Villages, Mojang has begun working on a new natural structure to make Komo think about where the shit all this stuff came from and eventually think of a story he's been contemplating on making..
Introducing,
NETHER RUINS.WOAH WOAH WOAH. SO NOW THERE ARE FORTRESSES, MADE OUT OF THE BLOOD ENCRUSTED EARTH THAT THE NETHER IS MADE OUT OF, AND THAT IS PRETTY COOL.
I am presuming that Nether Ruins/Fortresses will be home to the Zombie Pigman, due to my speculations on Pigmen being the villagers for, well, the Villages.
Also, we have a confirmed new biome, an "Infected Mushroom Forest." Check out the leaked picture.

So it seems that grass has now a very gray and brown blotched texture, like spores have slowly killed and eaten away at the plantlife. Also, there seems to be some natural Giant Mushrooms... and A FUCKING INFECTED COW HOLY FAFSDGSERNGIHERSARHRTERT.
Meet the "MooShroom." A common cow infected with parasitic Red Mushrooms, found only in mushroom biomes. Also, you can shear the mushrooms off, according to Notch.
There are also a few other confirmed things, such as, well, snow coming back, breeding animals, NPC Villages won't spawn all wonky and retarded. Abandoned Mine Shafts might be getting tweaked a bit. Something about skills may be implemented, that's still a bit unsure of. And, of course, NPC's should be in the update.
Also, there may be Volcanos in our near future.
Well, I guess this wasn't a huge spree of news about 1.9. I guess you could call it, a decent sized... BLOCK, of news. Hardeeharhar.