You can hear in sounds to be featured on the NX-2000 in a video I previously posted.
DST also recently posted a Star Trek Q and A, which included several answers denying potential candidates for the two new starship models they currently have in development. Ruled out this time were the Reliant Equinox, Promethus, Akira and any Klingon or Jem'Hadar ships. The Enterprise-C and Voyager were identified as ships with potential, but not one of the next two. While most promising there was simply "no comment" when asked about the Defiant and runabouts. A question was also asked about the Romulan warbird, with the answer focusing on the suggested size of the model in the question, rather than confirming or denying it as a possibility.