Only 106 days until a new Thunderbolt Display! I really hope that it turns into an "Apple TV" announcement.
http://arrival.io/apple-thunderbolt-display
As for Apple releasing a TV screen, I don't see it happening for at least a couple of years, if ever. There are too many things that need to be in place for Apple to be able to really change how people watch TV. For it to really shake things up, we need fast broadband everywhere, more (live) content in iTunes, a better input method (hand gestures? voice? touch?) to control the screen, and a more reliable wireless technology than (the current) WiFi.
There's been a lot of development on both smaller and larger screen sizes, but the 27" form factor seems to be at a relative standstill.
I don't expect to see an update unless there is a major change to either the panel tech or the interface tech. I really do hope that Apple reopens the >= 30-inch space though.
Shortly after that, Best Buy discounted them a bit ($50), suggesting to me they wanted to empty the shelves for new models (as they surely aren't automatic sales like iPads).
However, at this point I'm not convinced it'll be too soon, as whatever momentum the "signs" pointed to seems to have worn off.
A desktop Retina Display would be a great pairing with a Mac Pro replacement, which one might expect when Intel's Haswell starts shipping, which happens to be around 106 days from now. And they could retain the existing Thunderbolt Display as a lower-end model. (It also helps that Apple's current models all support outputting that resolution.)
A 4k Apple TV would allow them to differentiate from most of the TV market and soak up a fat margin in an area where only one of their major competitors (Samsung) as any position. And it wouldn't cannibalize the $99 Apple TV box in the process. There's still the chicken-and-egg problem of getting 4k content, but Apple, with iTunes and as a pipeline for Netflix, et al., seems to have a good position to get it.
[1] As a person so hip he doesn't own a TV or a Mac, yet finds the speculation irresistible.
I appear to be hellbanned from posting links, but I gather this from page 8 of AnandTech's review of the Thunderbolt display and the Wikipedia article for DisplayPort.