I apologize for the late review as I fell asleep lol! Here are my first impressions after playing several games on world class difficulty. I will bullet point these impressions.

Menus are very bright. You have to turn off the fifa trainer by clicking R3.
Kickoff games are 4min halfs and FUT draft games are 6min halfs.

New player instruction for all players: interception type. You can set this to aggressive or conservational. I believe this just affects whether or not players dive in trying to intercept balls.

The passing has been overhauled massively. Biggest one in the series to date. Passing feels a lot better but is much much harder to pull off. No more no-look aerial through balls from your 76 rated CM. They have made through balls incredibly hard, to the point where you really have to time them to perfection.

AI defenders are the best yet for a while. They position themselves really well. They block crosses a lot more and are able to deal with aerial through balls a lot of Fut 16 coins. The new slide tackling is also pretty useful. You can click square twice to cancel your slide tackle halfway through the animation. AI defenders are a lot harder to beat by dribbling around them. I think the standing tackle radius has been increased? I feel AI defenders rob the ball from your feet a lot more!

Players track back to defensive positions. For example, I finally had a counter attack on! I look up and spread a beautiful through ball to Willian but behold! A wild Raheem Sterling is sprinting alongside Willian and manages to intercept the ball near his own penalty box.

They still haven't fixed the short corner glitch. Unfortunately this still works from FIFA 15. You can hold L2 to ensure a player is already near you when you start the corner kick animation.

"Stay back while attacking" still doesn't work. I tried to see what Busequets would do with this instruction but I found him still wandering further forward a lot more, albeit not into the opposition penalty box but just outside it.

FUT draft is fun! You can't go back and change a player once you make a choice. This makes it very rewarding and risky because you can't go back and change a player once you make a choice. I think the players available in the draft are skewed since the player pool will be much smaller than FIFA 16.
The main two things people on reddit want to see:

Are goalkeepers fixed?Yes and No. Goalkeepers have been tuned a lot this year and I can see noticeable differences. Goalkeepers are very aggressive dealing with crosses, often rushing out to punch them away. I had a goalkeeper rush out like Petr Cech against West Ham and successfully punch the ball away from a free kick. They also hold onto the ball from shots a lot more and are much more reliable. But still there are niggling issues that persist. Goalkeepers still do not come out and catch easy deflections. They just chase the ball out for a corner. This hasn't been fixed forever. I haven't seen mine do anything too stupid yet.

Are headers OP? Yes, but it definitely isn't FIFA 14 OP. Why? Simple. Crosses are a lot harder to pull off, opposition defenders and goalkeepers routinely clear your crosses with ease, defenders often block your crosses and its all about choosing the right cross with Fifa 16 coins. I did notice it was a bit too easy for Eden Hazard to win headers and hopefully EA tune this down a little bit but right now crosses are much harder than 15 so it slightly offsets the op headers. Maybe people will find an exploit?

Do note that this demo version is an old build so will not contain the same gameplay as the final build but I am interested in the direction EA are taking. Much more emphasis on knowing when to pass and whether to touch R1 or not. This makes for a much better gameplay experience as you are not able to simply bypass the opposition midfield with through balls. The passing is probably the best thing about this FIFA.

Edit: forgot to mention the control vibration whenevet your player bumps into someone else lol. Referees are also a lot more vigilant, giving fouls for small shoulder barged or pushes

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