The PENTAX-DA★ 50-135mm f/2.8 ED [IF] SDM lens is listed as discontinued at several Japanese stores (the lens is no longer listed at Adorama and B&H – see also this related post, more discontinued Ricoh/Pentax products can be found here):
smc PENTAX-DA★ 50-135mm f/2.8 ED [IF] SDM lens listed as “completed production” and “limited stock”
Rumors about two new Pentax lenses: 70-300mm f/4.5-5.6 and 50-135mm f/2.8