Gus has been planning that shit for 20 years. It has nothing to do with Jesse and Walt's plan. It's a completely different poison anyway. Walt's poison causes a heart attack sometime within the next 48 hours. Besides that, it's not likely that Gus or Mike know anything about Walt's predilection for poison. Tuco died in a gun fight, and that's the only precedent for the plan.
Also, I don't think they had Jesse's place bugged because the night Jesse was at Gus's place, Gus started eating first even after Jesse had ample opportunity to use the poison.
I think it really was just coincidence.
Jesse could easily end this whole thing right now and walk away completely clean, and honestly, he should. Walt was completely right when he was listing off the things Gus did to them that made him deserve to die. I sincerely doubt it will happen though. Jesse was probably as impressed by Gus's display as anyone, and he'll likely harbor some delusions that Gus/Mike went out of his way to protect him. Jesse is almost certainly going to stick with Gus all the way home, and then possibly try to convince Walt to stop trying to kill him. Walt's reaction to that is obvious... Then Jesse is going to openly turn against Walt in favor of loyalty to Gus- which is ironic as hell, because saving Jesse is what put Walt at odds with Gus in the first place.
In fact, I believe that Jesse turning is what's going to drive Walt to help Hank with his case, which will be much easier since Mike is incapacitated.
As far as Skylar's little side-quest... I think that either Ted is going to be brought into the loop (to some extent) and his business used to help launder Walt's money, or he's going to be found dead sitting in his garage with his brand new Mercedes running and him in the front seat (not likely by his own choice).