The biggest change is that 3D spotting has mostly gone. It's replaced with a marker system primarily, although some 3D spotting still exists, caused by what I'm unsure. This means you have to be more aware of the surroundings, rather than looking for the Doritos, or just playing the minimap.
Movement is a little more clunky. If you fall from a height or parachute in, you can no longer just start running straight away, instead there is a half second or so delay as you stand up and get sorted. Other changes include support no longer being able to crawl along with perfect aim, they'll have no aim while moving and then a half second adjustment period after they stop.
Two game modes currently, Conquest and Grand Operations, which is a multi-map mixture of rush/conquest. A couple of new spawn mechanisms, include waves of aircraft, where you choose when to jump out, allowing you to try and get behind enemy lines. But the longer you wait, the closer you get to enemy AA, with you becoming a slow moving target for them.