I actually got that exact same letter. As well as a copy of my approved petition of the I-129F, and another letter indicating that they have begun the process of the fiancee visa case. It was those 3 items and also a pamphlet for the Chinese fiancee on what to do if you encounter domestic violence in America.
However, my letter (the one you took a photograph of) was a little bit different. Yours says "How to Submit Required Materials." Mine didn't say that.
When I got mine (around the beginning of June), we just did whats on the checklist (ds-230 part 1, copy of passport, photos) and then mailed it in by normal post. That was it. We didn't have to use CITIC bank for that process. We only used the CITIC bank for paying for the visa fee (but that was later).
After we sent in the package back to the embassy, a week later they contacted us through email and said we may start to schedule the interview (that was around June 15th and we finally got an interview slot today for late August).
So, unless within the past month they changed how to send the documents, I don't know what to tell you. Back in the beginning of June, we just mailed them by post to the embassy and we didn't have a problem.
Q&R got a reaction from Rob & Rachel in This is so messed up...