If all is true, the 5970 will have the shortest production run of any Patek Chrono/Perpetual in the company's history (2005-2008???). Having said that, the 5970 will still exceed total production of the 2499, which I believe was in production from approx. the early 1950's to 1984. Even the 5070 is relatively short-lived vs. it's predecessor : ref: 1463 (chrono).
At this stage, it's still a bit premature, and somewhat speculative.
Cheers.