Is the extendedi DLC all video or some gameplay involved ??
The DLC is most noticeable in the final scenes leading up to what is your decision in ending the war. There are several extended scenes that address some of the major plot holes in the ending, that alone was the first huge improvement. Its hard to remain vague but if you know the original ending you will be aware of what made it so frustrating, in the lead up and in how things played out.
Ultimately the last 15 minutes of gameplay remain largely the same, but the gameplay was never where the problem lay. The problem with Mass Effect 3 and what started this whole affair was the bad taste left in the mouth of the fans because of how bewildering the short abrupt ending was. It made no sense and in the grand scheme of things actually caused more problems than it solved.
I chose the same ending I had before and was pleasantly surprised by what happened. The original ending literally, much to the disappointment of my other half had me almost frothing at the mouth with anger. This however was actually very satisfying and once you actually come to see what I'm talking about, realise that for perhaps an extra 20 minutes worth of content tidied things up nicely. How Bioware thought the original ending was fit to ship is a miracle. Their reputation has been severely tarnished because of this and what amazes me most is that the DLC is actually so simple in how it extends the ending, that why they couldn't do it in the first place is beyond me.
If the ending hadn't improved my copy of ME3 would have been on ebay or on its way to the trade in counter on Amazon, but I can actually bring myself to play it again knowing that the series ending on a far more enjoyable note. I do have plans to play it again, I only need 3 achievements and hopefully if rumours are true the ending might expand further as well as the game play in between.
In fact I think I hear a new femshep calling out!