Nice, I like my Samsung version of the DA50-200 and would like it even more if it was sealed. For a while it was a lens many recommended, but after photozone published their test I don't see these recommendations very often.
Now, if you want a small, light, cheap and weather sealed tele zoom, I think this one will be hard to beat.
Now, wonder if they will release a da 55-300 wr? from what I have seen it seems a bit better than the 50-200 and the 300 reach would often be *very* useful, when you need tele.