There are a bunch of previews for the 5th edition DMG up on the main wizards site.
The latest is a preview for how you can create your own races and subraces. Two examples shown are Eladrin and Aasimar (a celestial version of tiefling). http://dnd.wizards.com/articles/features/excerpt-creating-new-race
There is also a preview of the magic items table, and a nice full page splash of potions. http://dnd.wizards.com/articles/features/excerpt-magic-items-art and http://dnd.wizards.com/articles/features/excerpt-magic-items-table
(Of course there were a bunch of things spoiled as part of the 24 hour livestream, including firearms, magic rings, and the deck of many things http://dnd.wizards.com/articles/news/extra-lifedmg-previews )
The latest is a preview for how you can create your own races and subraces. Two examples shown are Eladrin and Aasimar (a celestial version of tiefling). http://dnd.wizards.com/articles/features/excerpt-creating-new-race
There is also a preview of the magic items table, and a nice full page splash of potions. http://dnd.wizards.com/articles/features/excerpt-magic-items-art and http://dnd.wizards.com/articles/features/excerpt-magic-items-table
(Of course there were a bunch of things spoiled as part of the 24 hour livestream, including firearms, magic rings, and the deck of many things http://dnd.wizards.com/articles/news/extra-lifedmg-previews )