If you need a monitor now, get a Dell. The TBD is not worth the money right now, though the next version might be good.
If you can wait, definitely wait.
Wait for the new product announcements in Sept.
Thx. Do we know what is being announced as Apple's next cinema display?
No or you would be seeing threads and pages on it at Macworld, AppleInsider, , here and other sites....etc.
I would be very surprised about any new cinema display. On the other hand they could easily update the Thunderbolt Display to TB2, put in 4K, USB 3, and drop FW. If not 4K resolution, then at least the same resolution as the Retina MacBooks.