Not sure why nobody answered this but geofencing is a generic term that means setting an invisible barrier for many different reasons.
As it pertains to drones and in this case our Phantom it means setting a circumstance or area drawn out that the Phantom will stop at a virtual "fence" to stop it from entering a no-fly-zone or from hitting a power line or a mountain or whatever. I don't know what people's problem with it is to be honest, I've found it to work just fine for me but I've only tested it, don't really use it.
Back on the topic, I believe what they will announce is the availablity of obstacle avoidance for there entire line with the product that the DJI Matrice 100 had.
The Typhoon H stole the show with the Intel RealSense and anyone that was at CES 2016 can tell you why, it was impressive but as usual, the originators of things usually don't get the credit. It's gonna be hard with Intel and their R&D team behind them but I believe the avoidance system in the Matrice (which is already available for that system at least) made available as an add on for the Phantom and Inspire would keep DJI safe from a hostile take over of the market share by Yuneec who is set to release the Typhoon H without the Intel add on in April.
DJI CMO knows he needs to keep the market share because it's not at the point yet that it can't be stolen away.
At a $1700 entry point for a hex with conflict avoidance, it's a prosumer dream and DJI is not stupid.
My guess is the add on for obstacle avoidance that is found in the Matrice for its line.
I don't think it's time for a P4. If you start doing an iPhone style yearly release, people will stop buying them in my opinion. Well everyone but the pros.
My s1000 is still a workhorse and that's a pro UAS but even at $1000, you can't keep releasing a consumer drone every year.
That said, the technologies are increasing exponentially and once obstacle avoidance is there, everything else becomes nearly obsolete.
We will laugh at our current Phantoms in the not too distant future even if they will be historical.
Phantom Tomato. Really?
To the person with the geofencing question, the kitchen table guy does a half decent job of explaining it.