According to this article, a new D&D Next playtest packet will come out today. This one will take characters up to level 10. Except for healing rules and the need for more monsters, the core rules will be pretty complete at this point.
Coming after this playtest we will see:
- High-level play
- New classes and races
- Healing (updates based on playtest feedback; this is one mechanic which admittedly still needs some work)
- More monsters
In addition to the core rules, we can expect to see these add-on rules modules (which presumably will be independent from the core rules):
- Tactical combat
- Mass battles
- Realm management
- Structures for exploration and interaction
Signup for the playtest here.