Yes we would like that too, as NatTable itself is build with Tycho.
Unfortunately there is no active p2 repository at the moment. There are still some open tickets for the Orbit team to add GlazedLists and Apache POI, which are third-party dependencies of the NatTable extensions. Without them added to Orbit, we can't create a full build on Hudson to create the p2 repository.
We are working on that and have created the basics for it already in Hudson. Hopefully we are soon able to provide NatTable within the Nebula Update Site.