I found
this listing with features (unconfirmed) at gameplay.co.uk. I'd guess the various commentaries will discuss (if not explain) most of the differences.
I caught the DC a few weeks ago (the original really surprised me, so I will probably always prefer it). 'Time Travel' elements are more developed (maybe too much for me) but a few character scenes were great (like Donnie & his dad). I noticed a few songs moved/added, most notably 'Killing Moon' moved to the last act (don't recall the new opening song).