In the context of these discussions, the majority of us rather agreed that it is a good idea to go publicely online as soon as possible, even if this means that we focus on the Q&A section first while keep developping the (hidden) Reviews part of PhysicsOverflow.
So lets get serious about that now :-)
As this thread was written, we assumed that the Reviews and Q&A sections will be brought online at the same time, before we realized that developping the Reviews section is slightly more involved than thought at a first glance, so it still contains many issues that can actually savely be solved while the site is already publicely online.
So lets make a new list of things that urgently and seriously need to be done before going publicly online with the Q&A part of PhysicsOverflow ("Public Beta"), because if not resolved they would strongly handicap the functionality of the site, make us look unprofessional / diletante / or otherwise bad, etc ...
Making this final todo list should be rather straight forward, as we need mostly to take out and copy here the relevant unresolve issues already listed here, here, here, and here for example.
So when everything in the emerging (and hopefully not eternally inflating) todo list is [DONE], [RESOLVED], or [DEFERRED], PhysicsOverflow should finally get born !
Note that certain things (such as adjusting the permissions in the Admin Panel, moving the URL to our final home, etc) should and can be done only a short time before the big bang PhysicsOverflow will hopefully make in the physics online community :-) ...