The Press are wetting themselves over the prospect of a 'New Diana'. She sold millions of papers and magazines.
If Kate has any sense she'll make sure her appearances are limited and she doesn't talk to any journalist.
However the Murdoch press is likely to print any old shite in order to sell their rags. So she's onto a loser by marrying into the monarchy.
As to aristocratic links, My Uncle would have been the Earl of St Germans except for a number of incidents during the Crimean War. I have a Great-Great-Aunt who was an Eliot, the family name of the Earl.
As a Republican this is a burden!
Vive La Révolution!