What a cool idea!
What about things like firsts for your kids like first day at school, first dance, first boyfriend/girlfriend?
Have you done anything special or that could be like a "throwback" such as going to the place that you went to when you dated, a picture with your friends that were in your wedding, etc. So you could do photos of you all then (or when you and he were at that special place in the past) with a photo of you all now.
Do you have any family traditions that weren't in your first book? Family movie nights, him always doing a particular task each season (like hanging the holiday lights, being the first one to taste test holiday meals, etc)
Maybe a page about the habits you've learned to love over the last 10 years
Has there been anything big in the last 10 years like an anniversary at work (15 yrs at the job type thing), big promotions, etc?
Memorial pages for family members who passed away? Like special memories with great grandma, etc.