Well, let's see what people need.
GMs
1. A tool that let them plan and write the adventure. As a friend said, something like scrivener.
2. A tool for creating encounters, implemented in the "scrivener - style" app.
3. The ability to insert images and maps
4. A tablet app that will be able to "read" all the above. It shouldn't do a lot of fancy things. Just show the text, double tap to show images in fullscreen, maybe the ability to subtract hp from monsters. It should present the content, not edit it.
Players
1. A nice character creator, like the 4e offline program.
Both
1. The ability to buy and read the books in a tablet or a pc. It could be an app, instead of a pdf, if they are afraid of piracy. Actually, it doesn't really matter, because everything digital is going to be pirated. However, everyone should be able to buy an electronic version of the books because if they don't, it's possible that they will try to find another way.
Many might say that that's not enough or that tools like these don't suit them. But we can't start from the ability to customize in order to import your home rules, before building the actual software. Wotc should start from asking "what people needs", what is the process of designing and then playing an adventure. Well, GMs plan, write and then must have a way to actually take with them the result of their efforts. Players create and upgrade their characters. Everything else is optional.
I am curious though, they asked as what colour the new logo should be, did they ever ask how the digital tools should be?
(sorry for my english)