My best guesses, more or less.
OK, I'm a big fan of Colony. It keeps me guessing and on the edge of my seat. Now, that being said, I'm glad they're plan is to move the show forward with some bigger reveals concerning the Hosts. For me, at least, lagging on such big reveals, has caused me to lose interest in what I considered really good shows, like "Lost".
So here are my spoiler conclusions/best guesses from watching seasons 1&2:
1) The drones are captured humans, somehow altered at the "Factory", that's why they seem to ally with some characters. It's either that or, some are controlled by the "Host"'s inner resistance.
2) The hosts and the wall have been there longer than the players are able to recall correctly/accurately- I base this conclusion on the amount of plant and tree growth surrounding L.A.
3) The "Hosts" never came to earth, but a secret government on earth is actually using the RAP to control the population and resources. For what purpose? Yet to be determined. This, I based on the odd things the citizen leaders were collecting, like art for instance. Why would a species with the power to easily take our world be interested in human trappings? Beats me.
Love, love the series! Can't wait for season 3, so I can see how much I got wrong.