I read that Panasonic has said that they'll ship sometime next month. Haven't heard anything from Sony, Samsung, Sharp, or LG. Going off of what I saw last year the LG's rolled out and arrived first, then the Samsung's, then Sony and Sharp in that order. All of which were nearly, or completely out by first week of April, excluding the Sharp Elite which never received a revamp, and the HX950 of course.
And TGM, I'm in the same boat as you, very interested to see how they perform. I'm also looking forward to seeing the 2013 Sharp's, I feel like they had a pretty stellar year for their FP's and actually managed to post a profit in Q3, which is somewhat encouraging, albeit a small profit, I wish Sharp a bright future.