Many devoted fans have already been uncovering easter eggs and some unique locations. Many people have started posting their discoveries all over the web and I myself have uncovered some locations worth taking a look at. As most have seen by now there is an island at the top left of the map that seems very familiar. It is a complete recreation of the island from LOST and as you near it the weather will start to become dark and cloudy.
If you fly a plane over it a blue light will appear and after a small explosive noise your plane will burst into flames forcing you to abandon it. While on the ground rain will pour down upon you as you journey through the forests. Bridges, towers, broken plane parts, a”SEARCH” sign, and the hatch can all be found here. Make your way to the main glowing blue orb and you will meet some opposition.
Another interesting place can be found on the right side of the map. You may notice two blimps in the air carrying a ship. Fly up to it and you will notice that it is a fancy club. It is not just any club though! This is the Mile High Club. There are pole dancers, DJs, and businessmen enjoying themselves up there. After you are done exploring the club head towards the very back and there will be a secret jet waiting to be stolen (along with a nearby armor upgrade).
I will be sure to update this as I uncover new locations for everyone to explore. Also, if you have stumbled upon something great be sure to share it in the comments below.