Moon of Alabama has an interesting theory. In short, he thinks it was because Israel was about to be suspended from FIFA.
Crazy overkill to even consider this (fairly typical for him I think). One thing: "There was a good chance that [the expulsion vote] was going to be successful." -- I browse the soccer websites often and didn't realize that. I wonder if it's true. Israel always has pull, Palestine generally doesn't. There's a lot of money in Arab soccer... impossible to say.
Sounds like some contortions. This investigation goes back years. Loretta Lynch has been heading it for a long time. She's now AG, and this is the first time since her appointment that all these guys are gathered in the same place at the same time. Also, MoA is going a bit far when they say the US "ordered" Swiss authorities to do this or that. To claim that Israel has the power to order the US to order Switzerland (who has a long history of persecuting Jews) to arrest FIFA officials is a claim that needs a bit more evidence than "timing".