Lag is affecting a lot of the gameplay so don't be too worried about hit detection until the game comes out. The new knife kills are great, been able to counter two of them without too much bother. The ability to dive is handy for capturing a particular flag while underwater and the bigger squads/more spawns are a match-saver.
The 360 version is lacking in terms of levels of damage, cover, number of vehicles and general awesomeness so bear that in mind - the One version should be a hundred times better (the PC version I'm judging it on is well nice).
As for the actual matches I've been in - tanks have zero armour and the Scout heli has a little too much (it can bounce off buildings now). The tanks are a bit of a headache, I have not found out how to tell when the shells are running low or have run out. You could end up reloading when you need a shell the most so don't waste them. The HUD has indicators which count in the centre but what they mean idk?
Weapons are pretty good, burst fire is the way to go as usual and the new sniper rifles seem to be quite easy to use having very little bullet drop.
The inclusion of lifts in a few (find them!) buildings is great for snipers and general "jumping off of stuff" but provide an extra way to get to flag locations. Walking out of a lift with your eyes closed is not recommended - come out all guns blazing. The bollards are handy to either ambush tanks, slow them down and to piss people off! Note that that IFVs can almost jump them without stopping but take damage in the process.
As for the rest of the map, on PC you can see how handy the boats will be when we get the full map on the Xbox One. The map looks great as promised even on 360. Once the building comes down though that prettiness is hidden under a brown layer of dust unfortunately.
The controls are another pain but once you get as close to what you are used to they are fine. I have my vehicle buttons on Veteran (BF3-like) and my heli sticks on Southpaw which helps. I had to disable the Battlelog (select) button as I was pressing it to spot instead of R8 and getting myself killed.
That is all for now...