Adobe is abandoning its Creative Suite entirely to focus efforts on Creative Cloud.
CS6 will still be available for sale, but otherwise if you want the newest software it’ll only be available through subscription. $50/month for the whole suite or $20/month for single apps.
I’m still using CS3 (Photoshop and InDesign mostly), and as long as they still still work on my Mac then I have no motivation to upgrade. Heck, I’d probably still be on CS1 if I hadn’t been forced to update after the switch to Intel.