Per the Green Papers, the Democrats currently count 747 superdelegates to the 2016 Democratic National Convention.
Of course, the number will change, as:
Democratic unpledged delegate counts are determined by the number of DNC Members, Democratic Governors, Democratic U.S. House members, and Democratic U.S. Senators serving at the time of the convention. The count for DNC Members, Distinguished Party Leaders is from the 2012 Convention. The tallies of Governors, Democratic U.S. House members, and Democratic U.S. Senators are the current officeholders.
Add in 4336 pledged delegates, and you get a total of 5083, so it will take 2542 delegates to secure the nomination in 2016.
Which means Hillary Clinton only needs 2541 more delegates (assuming she gets Bill's vote!) to clinch the nomination.
Of course, the same holds true for Joe Biden.
And Andrew Cuomo. (Assuming he gets reelected in 2014)
And Martin O'Malley
And Kirsten Gillibrand