He's totally retconning the Star Wars thing. If he had always planned for Brom to be his dad, then there would have been no point whatsoever in revealing that Morzan was his father before. Plus because of the obvious way he just inserted that chapter--it had no business in the larger plot of the story (even if that's already in tatters) and seems obviously forced in and random.

As for plot... well, let's see. What's happened so far? I believe Roran and Eragon both killed the Ra'zac or whatever the hell they're called. Then Roran fought some battles and Eragon hung out with the dwarves.

So the plot is... uh... Roran and Eragon doing... stuff. Stuff that doesn't even have their own plots, just events Happening, and none of them seem to serve the larger purpose of preparation for their inevitable Epic Battle against Galby.