^ On November 22, there were pictures of Catherine grocery shopping - a day or two before, she (tried to quietly) visit at a school; on November 26, there was a story about William being part of a team that rescued Russians from the frigid waters off of Wales; and I've just now read tweets from @RegalEyes (Mark Stewart) and @SkyNewsRoyal (Paul Harrison) of being at the Queen's Diamond Jubilee Reception. Charles and Camilla were present, as well as William and Kate. There may be other places/events that they've been to in the last week that we haven't heard about.
None of these (in the above paragraph) were 'public' (no official photographs) outings/engagements, etc. However, in my opinion, it does show that William and Catherine are doing what they said they would be doing.