I'm very happy to see that the Xonotic development is continuing in a good direction. It's so great that CSQC-networked-players has finally made it, and that additional, high quality maps are available. Does the new networked-player feature mean better local movement prediction now becomes possible (but probably is not in 0.6 yet)? In any case, I'll give it a shot some time (since I live in a different location where Internet at evening times is really bad, I'm curious to see how Xonotic performs now
)
BTW: I was unable to understand the sandbox mode from the textual description. It seems to be similar to what was possible (using sv_cheats 1) earlier in Nexuiz, where you cloned your own player model.