I'm a brand-new member, with only 6 posts under my belt, and as such, consider myself to be nothing more than a guest here at AVS. So I'm naturally not looking to get into any beefs, especially with a senior member with hundreds of posts to his credit... But respectfully, I must disagree with your assertion, to wit, that the pending thing that we are not allowed to discuss here, is now in the way of a fix.
IMO, all Panasonic needs to do, to come out of this, only somewhat worse for wear, would be to provide a fix that (a) does absolutely nothing and (b) fixes the problem. Because (a) would make Bob Perry's statement legally correct that the devices are "operating properly and as designed" and (b) would turn the growing [everyday] number of angry/disgruntled customers and CE REVIEWERS into slaphappy Panny lovers.
Here's just one possible solution that would at once, do nothing, and do everything:
Publish a firmware update that provides two additional user control/settings on one of the video menus, perhaps right under the BLACKS "LIGHT OR DARK" setting. The first box would say MLL ADJUST and have two settings: AUTO and MANUAL. The AUTO setting would be the DEFAULT [present after the firmware update] and do absolutely NOTHING, leaving the panels auto/timed rises completely unchanged... "operating normally and as designed"... The second box, ONLY HIGHLIGHTED IF YOU SELECT MANUAL would offer four values... ONE, TWO, THREE, FOUR, corresponding to the [presumed based on the data we have before us] values that Panasonic is already using when the pre-programmed rises occur... My assumption being that VALUE ONE would restore our panels to aproximately a .007 MLL . Should the panels begin to misfire, as they age, we could simply go into the video menu and switch the MANUAL setting from value ONE to value TWO [and so forth into the future].
The beauty being that even those owners that were unfamiliar with this protocol, who initially selected MANUAL rather than the DEFAULT AUTO after the firmware update, and had forgotten or sold the set, when calling Panasonic's Viera Concierge would actually be able to obtain a quick/simple solution to the problem... Shocking as that idea may seem to anyone who has called them thus far.