I think that it was on a financial report that B&O stated that the 10 will be based on the 8 technology, with another speaker and design... Maybe it was a news from an insider, not sure. But that fact is sure.
Concerning the 2 sockets, I was hoping that B&O could change only the last circuitry in the bv8 chassis to add some sockets without any development cost (as it's basically an integrated switch with more ports, a cheap circuit which doesn't add complexity to the electronic architecture), but B&O seems to have choosen to keep the whole bv8 package without modifying anything.