There has been a lot of rumors about what Adobe is doing with Photoshop CS6 and the Creative Cloud. Most of these rumors are due to a complete lack of factual information (shocker!).
Here is really what it all amounts to...
1. If want to buy CS6 out right and own it then you can do so without an issue. In fact you can go here to make the purchase. You will not have access to the NEW features as they are released but Adobe WILL supply bug fixes etc. This is really no different than any other version of Photoshop in the past.
2. The Creative Cloud cost for CS6 is 19.99 per month and you get all the new features as they come out.
3. The $50.00 a month subscription you keep hearing about on the net is for the full Creative Suite. You get EVERYTHING for $50 per month! This really isn't a bad deal if you use Photoshop, Lightroom, Premiere Pro, Adobe PDF, After Effects..... etc....
4. Adobe is just doing all this to try and get you to subscribe to the Creative Cloud. Well, duh! They are in this for the money after all.
Scott Kelby put up a great post answering many of the questions being raised. You can find that here: http://scottkelby.com/2013/my-take-on-adobes-announcements-yesterday-at-the-max-conference/