This demo is supposed to be from a later build, but that's the only difference. From what I remember you had some developer walking you through the IQ test in the DVD version, but in this one you have Madden. I didn't really pay too much attention to the earlier videos, so I couldn;t tell you what's different specifically other than that. Some quick things:
POSITIVES:
-Game looks fantastic.
-Running feels terrific and much more "weighted" and less wild than last year (I immediately got a taste of what DonF was talking about...fighting through tackles looks and feels amazing...very realistic)
-Deep passes feel much more realistic and receivers catch the ball in stride. There seems to be very little margin for error, but I think I like that to be honest.
-The OL does seem to play better than last year...there is actually a semblance of a pocket and they pull out appropriately and engage well on stretch plays.
-Passing game as a whole feels much better. You sling the ball around like a madman you'll be punished...but not by superhuman LB's, but by fairly solid play.
-Celebrations look excellent also (did the "soldja boy" and some other little dance)
-Overall play feel more controlled and not as herky jerky as 08. Animations seem much improved.
NEGATIVES:
-Madden IQ test seemed aweful easy on offense. I got All-Madden right off the bat on both passing and running. Passing I might have earned (you basically get high IQ for making a completion each time...not hard to do with good reads, IMO). Running was a little too forgiving in the simulator, but did feel great in game, so we'll see.
-Still some quirky animations and "gliding" players (especially when lining up)
-Pocket is improved, but not a true pocket yet, IMO.
-QB seems to be on speed in the dropback and seems to move faster than the rest of the players on the field. This may be the big contributor to a weak pocket as its hard to build around a guy who dropped back 100mph behind you.
-Ball still seems to "warp" into hands at times...more of an animation quirk than an actual gameplay one though (I think)
That's my quick assessment for now. Overall, I'm fairly satisfied. It is hard to get a true feel without playing D or special teams, but I think some will be pleasantly surprised.
EDIT: A quick note on tackling. You can really tell this has been improved. Guys "clean up" and finish tackles better than 08 (though still not perfect). Also, there are still some bad animations like the cartoonish "fall flat on your back" results, but I only saw that oonce or twice, so it would appear they've at least been toned down.