Don't worry. Like jinto12, I too recvd similar interview letter. Met couple of other people waiting in immigration office who were carrying similar letter. To our surprise it was an interview for naturalization (History + Civics). End of interview Officer congratulated and advised to wait for oath date (hopefully) in Sept. If not in Sept then it will be after elections.
Originally Posted by jenkits
So start preparing for your interview and carry all papers though he did not ask for any.
Oct 30, 07 - PD
Jan 18, 08 - FP done
Jul 18, 08 - Interview letter recvd
Jul 25, 08 - Recvd letter to meet Adjudication officer
Aug 09, 08 - Interview with Adjudication officer (passed US history/civics test)
Sep 15, 08 - Interview Date (date was preponed to Aug 09, 08)
Aug 29, 08 - Recvd Oath letter
Sept 26, 08 - Oath ceremony @ LA Sports Arena - Done