I see, all children in F3 and FNV are androids!
I'm with the EVERYONE IS AN ANDROID theory.
The "synths" you see in the trailer are respawns of raiders/ghoul/super mutants you killed earlier. FACT.
I have to say I really don't like how we find the dog. Just standing there, has no problem with us walking up to it, we pat it's head and now it's our best friend for life ... REALLY?
Generally a dog that doesn't know you isn't going to let you near it. If it IS that friendly then someone else would already be it's owner. I was hoping we'd help the dog out somehow, maybe find it starving and have to give it a StimPak and some food to recover ... and then it likes you.
As far as the dog not being a dog ... I can't imagine why they would do that. We had some robot enhanced dogs in NV so it's feasible, but I would hope for a real dog (made of pixels) as opposed to an android dog (made of pixels) for my pixieled PC self.