Other than they've announced intentions to develop an FDL-7 based spaceplane and that they've signed a Space Act agreement with NASA for information sharing, not much. There is also that they plan on using 287 V2-style engines in the Silver Dart's booster. Much of this is available here;<br /><br />http://www.planetspace.org/lo/osf.htm <div class="Discussion_UserSignature"> </div>