Got my DVD today from Play.com It's fantastic. But noticed one thing which kinda made me think. On the DVD it says 145 mins approx. I swear the theatrical release was 152 mins? Anyway the colour of some of the scenes is changed (as mentioned by some other people who got the DVD, Blu-Ray earlier).
Also the scenes seem to have much more contrast and detail within them. In the cinema some scenes seemed a bit washed out, but DVD release has solid colours, sometimes bit too dark in dark scenes to see detail (But maybe i'll try adjusting my TV, it doesn't bother me anyway).
The sound quality is superb. My 5.1 system was literally blasting out so much bass. The whole sound mix and music has low frequency bass which gives the action scenes that extra thump.
Extras aren't as bad as i expected, BUT could still be much better. Seems like no characters are discussed at all really. No Joker feature.
IMAX scenes come out square so if you have a widescreen TV you may be slightly disappointed with the output, as i was.
All in all a fantastic purchase. Glad i finally got it. I've added some images below. The images of the art cards are a Play.com exclusive.