We ran through one session of DnD next. To me it felt like another 'd20 variant with a retro flavor', such as Castles and Crusades or DCC. However, things to keep in mind...
1- What we are playing may or may not resemble the final product
2- We only get the first 3 levels... which to me, have been VERY similar in Basic D&D, 1e, 2e, 3e, 3.5, and even 4e! Higher level playtest should showcase the difference better
3- The recent article regarding stable AC, to hit, and skill DCs throughout all levels, with advancement reflected by damage and hit points, sounds truly innovative... but we don't know if they'll adopt it!