At Origins, Wizards revealed the online tool set for 5th edition D&D.
Called Project Morningstar for now, it appears to be quite well along in development, nearly ready for the release of the new game. Unlike the debacle of the 4E tools, this thing looks like WotC learned some important lessons. At no time do I recall hearing a promise for a grand set of online tools well before such a thing was in hand.
I'll spare repeating a lot of the details here since there is a pretty detailed batch of information and pictures over at ENWorld where I learned about it.
From the info and pictures it can obviously be used on various tablets so the old issue of Silverlight enabled only computers has been pushed into the dustbin.