So I watched Extant last night.
In short, I enjoyed it, and will be watching it again next week.
In long:
It's a fairly generic sci-fi series with a number of, honestly, not particularly inspired key storylines.
You have the two that were advertised:
13 month solo mission in space so how did Halle Berry get pregnant? (Particularly since she couldn't get pregnant as it was.)
Creepy child robot is creepy, when will he go on a killing spree and take over the human race? (Particularly since he actively has no off switch.)
And the storyline that wasn't advertised:
What is going on with the stereotypical Japanese super businessman's stereotypical megacorporation? (Particularly since they've got a hand in everything from space travel to robotics.)
There's a lot of cool sci-fi things going on, like sci-fi garbage cans, there's a lot of product placement going on, we have touchscreen mirrors and 3D screenless holograms but sure, everyone uses Microsoft Surface Pros, and there's a lot of just plain dumb stuff like, "How dare you ask if my robot army has a kill switch in case they go psycho? Does your daughter have a kill switch in case she goes psycho?" and "Oh sure, you were knocked up by the alien ghost of your ex lover, makes sense."
But the acting is good, the effects are good and it's totally worth watching.