Yes, you should mention the pending i751.
However, you should assume you will have a combo i751/n400 interview. If your ROC is a joint application, then you should bring your spouse to the interview, along with additional updated good faith marriage proof.
It is common for the USCIS field office not to indicate on the appointment letter that it will be a combo interview will happen. At our interview in Sacramento last May the invitation did not indicate a combo i751/n400 interview but in fact it was. So, you should expect that it is a combo interview. Sometime USCIS field office is not prepared to do the combo interview and will only do the n400, if so, your case will take longer to get approved as your n400 cannot be approved until the i751 case is approved.
Bring what you are directed to bring in the n400 invitation. The original documents you use as evidence submitted with the n400 application like US birth certificate, naturalization certificates, wedding certificate, divorce decrees, latest tax transcripts... I would also bring current IDs for you and your spouse.
With a n400 under the 3-year rule it is always good to being your spouse just for that interview. But with a possible i751 interview it is 100% required to bring the spouse or your i751 & n400 cases may be denied.