I haven't seen any news on the evolution of the Fenix LD12/22 PD22/32. Your safest bet is probably to write Fenix a mail and ask them directly.
From my experience Fenix CS are very friendly and quick to reply too.
If you are on FB, I think their page is called Fenix Worldwide: you could possibly post the question in a comment there but with all comments from hundreds of users it might go unnoticed or they might not want to disclose their upcoming products.
My take is, considering the S2 version of the LD12/22 PD22/32 were released recently, I wouldn't expect something newer before Christmas at the very earliest, possibly not before Q1/Q2 2013.
The newer version could simply be the same lights with a newer emitter (XP-G2). I wish they would update their LD10/20 PD31 lights with newer emitters but I think is unlikely - unless their sales of the LD12/22 PD32 dropped significantly compared to the earlier models.
If you like the new PD32 UI, you should get it.
Hope it helps!