I don't think it has to be as early as June. Manufacturing, yes. Assembly, packing and shipping - probably August so it's happening right now. I know it's a lot of units but aren't those people at Foxconn or whoever is producing PS4 now ready for such events? I think we will see the OS 1.0 at Gamescom but, of course, the first thing I'll do after unpacking the console will be connecting it to Internet for the newest FW. Launch day electronics always has birth pains.
Regarding the date. Sony repeats that "PS4 is coming this holiday". What's your understanding of the word "holiday", US-GAF? I think October would be a bit early, wouldn't it?