Here is what I know (very little) and what I am guessing is going on currently......
CBS reports that the casting is officially over. However based on past seasons - if you are in your 20s and have an agent and live in the LA area - you might still yet be cast for the show.
A very small amount of the house guests each year are actually found by casting - most are actually discovered by the casting people or agents send in people from their 'stable' they think fit the kind of characters they need for the show.
If it hasn't happened already, the people that have been cast will be moved into individual hotel rooms to keep them isolated for the most part (although previous cast members have said they ate together but were not supposed to talk). For a little Big Brother trivia, it was at this point during Big Brother 4 that Brandon Showalter lost his chance to be in the Big Brother house when he broke out of his hotel room to call his girlfriend (I'll post that story soon). He was replaced by Jee Choe who was the "ex" of eventual winner Jun Song.
Around July 3rd or 4th the HGs that have made the cut will be moved into the Big Brother house and the taping will begin. We won't get to see them live until after the July 8th season premiere but they will use the tape compiled from the time the HGs enter the house until July 8th for the first couple of shows.
The live feeds - in my opinion THE reason to watch Big Brother will be back - I haven't heard any 'new' news in this area but I assume we will once again have four feeds and the ability to flashback to parts earlier in the feeds (but not before July 8th). This is a great feature as it allows all of us to go back and watch anything we missed over and over again (can you say Chima's mic tossing or Ronnie's calling out?).
Big Brother After Dark will also be shown again so those with showtime will get a few hours of the show - in the past it was 12am - 3am Eastern - I'd assume this will be the case again.
Feel free to ask away in the comments section if you have any questions and one of use will give the best answer we have.
One last thing - the 'staff' of Big Brother Gossip will be growing a bit this season. I'm still not sure who all will be participating but I would expect at least two or three new faces - all long time Big Brother fans. I'm looking forward to the new folks helping out as well as the others that have helped in the past!
My name is Kelley and I will be one of the new faces here blogging about BB. I pretty pumped for this season and I cant wait for it to begin! I will warn you I can be the queen of run on sentences :). Anyways just wanted to throw in a little hello and I can't wait to start throwing out my opinions.