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):
The HD Pentax DA 15mm f/4 ED AL Limited silver lens is probably discontinued
Via Asobinet