Filming for Star Wars Episode 7 has actually already started with the 2nd unit crew in Abu Dhabi filming scenes set on Tatooine. All we know about that is there is a large set piece that got rolled out. many seem to think it is a foot for an AT-AT.
There has been no casting announcements made as of yet, but principle filming is to begin soon at Pinewood Studios outside of London. Three individuals connected with the original Star Wars trilogy (Carrie Fisher, Harrison Ford, and Mark Hamill) all seem to be converging on London right now. My guess is we will be getting various updates over the next few weeks.
Here in Denver we are going to have the Starfest convention next weekend. One guest will be Billy Dee Williams. I would bet anything that he will be asked over and over again if he is going to get to be in the new trilogy or some alteration of that.
After the total disappointment the prequels were, I think we are seeing a huge build up in excitement due to the hope that they get it right this time.