I don't think that there is any difference as to weather-sealing capability. but if you are going to read about the new WR kit lenses, they seem to say that it is more WR compared to the DA*s. definitely the 900 dollar difference makes enough sense not to go for the DA* if you're not worried about the SDM and 2.8. IQ-wise, the new kit lens is holding it's own and better than the past 2 previous generations of DA kit lenses. I saw some sample shots from NED, and for me, that is enough reason that you should go for that lens. look at this way, atleast you got 900 bucks left to spend on the other telezoom WR kit lens and one or two specialized prime lens. the DA 40 is selling at 300 and WR 55-200 at 200. that would leave you a 400 dollar savings.
or instead of a DA 40, you'll buy either a 35, 21, 100 macro, 14 or a 135.