Direct from the official Blizzard site;

The next patch is just around the corner (it really is) and I wanted to give you all a quick glance at what’s coming up:

The level cap will be increased to 50.

The Sunken Temple, a dungeon in Swamp of Sorrows, will be opened.

Many of the quests in The Barrens will be reworked or polished.

New death graphics will be implemented. More sneak peeks to come. Enjoy these tidbits!