i don't know where you heard mid-Feb, that's a new one to me. mostly i've been hearing end of Q2 (i'm pretty sure that came from Moto, in response to the "unfixable flaw" brewhaha). but, there have also been some recent rumors pop up of late March, or maybe early Q2.
i suck at betting; but i would still bet on mid to late Q2.
Thunderbolt tbr in 2 weeks........Bionic tbr by June~ We recieved a email today at work stating that. They are trying to get it released for Val. day... but there has been issues getting them out or something like that~
FWIW, I don't know when EOL is for the DX, but the VZW website is showing refurbished units only when I browse for phones>smartphones and go to the DX. I called VZW CS and they do have new DX's available but show LOW STOCK.
That's good news for those of us looking for an early April release, as it's likely to coincide with EOL for the DX.