Line 6 has participated in NAMM every year since I've been around here. And last year NAMM was where they made the big announcement re: the Live Sound products line (StageSource / StageScape). So I'm not sure I agree with you about that.

But to get to your question - Line 6 has already stated that they will announce details of a new JTV guitar, as well as a new JTV models update providing HD versions of the guitar modeling. (See the News section of this website - link at bottom of page). They are also on record (last fall) of projecting updates to the Live Sound product line early in 2013. I kind of expect a NAMM  announcement of that as well.

As for the HD series, I expect that will come later - so, depending on how far away your 'corner' is, the next update (if there is one) may or may not be just around it.