I was a bit hopeful when supplies became constrained in the non-Apple Store channels: http://www.macrumors.com/2013/01/14/apple-thunderbolt-displa...

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.