5th and final edition... so far

 3rd of July 2014 the Wizards Coast announced the fifth edition of the Players handbook, Monsters manuel and DM's guide, They also released earlier a D&D next booklet that was made for pre-testing but sent out the the public instead to see there response was mostly negative so Wizard Coast decided to recall the copies and make the new 5th edition of D&D.    

    The fifth edition's Basic Rules, a free PDF containing complete rules for play and a subset of the player and DM content from the core rulebooks, was released on July 3, 2014.The Starter Set was released on July 15, featuring a set of pregenerated characters, a set of instructions for basic play, and the adventure module Lost Mine of Phandelver. 

The Difference between 4th and 5th edition 

-Actions are now more dependent on checks made with the six core abilities with skills taking a more supportive role.

-Saving throws are reworked to be situational checks based on the six core abilities instead of generic d20 rolls.

-The "Advantage/Disadvantage" mechanic was introduced, streamlining conditional and situational modifiers to a simpler mechanic: rolling two d20s for a situation and taking the higher of the two for "advantage" and the lower of the two for "disadvantage" and cancelling each other out when both apply.
and many more things they added to make the game more fun.