I called buydig and verified my order. They did confirm it was a WR lens (Mfg Part# 21880). I also received a shipping confirmation from them:
PKDA1855AL - DA 18-55mm f/3.5-5.6 AL Weather Resistant Lens for Pentax Digital SLR Camera 1
PKK5 - K-5 Weatherproof Digital SLR Digital Camera Body w/ 1080p HD Video 1
Chances are you will NOT receive the correct lens since what most CSR are doing is just reading the description and not actually verifying anything, I'm just saying.
Since some have already commented that they DIDN'T receive the WR lens even after it was suppose to have it. I'm not taking that chance and having to send everything back. Good luck though!