You are correct. Nothing pertaining to advertising is changing. The FDIC advertising rules stay the same. The gold/black signage, use of Member FDIC/FDIC-Insured that is all the same. So, on rate sheets, printed advertisements, social media, etc. there is no change.
Lobby signage is an optional change. There is a provision to remove the signage required at each teller window if the gold/black signage is posted in a location that is of sufficient size and continuously displayed (i.e., screen or poster) and can be seen from everywhere a deposit can be taken. This was added to accommodate updated lobbies using a café-style layout.
The new navy/black digital logo is only for websites, online/mobile banking, and ATMs.
There are other changes if the Institution offers non-deposit products as well.
TCA has a couple of articles on our website about this and the FDIC Q&As are a great resource.
https://www.tcaregs.com/updates-to-the-fdic-official-signage-rule-and-qa/
https://www.fdic.gov/deposit-insurance/questions-and-answers-related-fdics-part-328-final-rule

