During the same Q&A that revealed more GTA V info is on the way in a few months' time, Rockstar has stated that they haven't ruled out continued development of the L.A. Noire franchise, even though there's nothing currently in the works.
"While there won’t be any more DLC or additional content for the current release of L.A. Noire (we’re all too busy working on Max Payne 3, GTAV and other games to come), don’t count out the possibility of a new game in the L.A. Noire franchise in the future," the statement reads. "We simply have not decided anything. We’re all very pleased with how that game turned out and are considering what the future may hold for L.A. Noire as a series."
L.A. Noire developer Team Bondi went bust shortly after the game was released, but Rockstar still holds ownership of the IP and could conceivably develop a sequel internally. Of course, just because it's plausible doesn't mean we can expect a follow-up anytime soon, a fact that Rockstar is quick to point out.
"We don’t always rush to make sequels, but that does not mean we won’t get to them eventually – see Max and Red Dead for evidence of that – we have so many games we want to make and the issue is always one of bandwidth and timing."