I got one of those letters when I applied for FLR, Missy. I expected one, though, as I was applying for an Unmarried Partner visa & my situation wasn't straightforward. I'm very surprised that you've gotten one, given that you've come in on a fiancee visa & you're now married!
If it makes you feel better, I received my visa grant about a week after I got the letter saying it needed to be passed on for further consideration.