Dear Dmitry,
Sorry, I didn't notice that Jake already posed this question just some days ago.
However, I do hope that you will give it some priority, since WMV is a very common format, and there are no good editors around for it.
For MPEG editing, on the other hand, there are heaps of other products, notably the Womble MPEG Video Wizard DVD, which costs almost the same as the Solveig Splitter, but is much more powerful.
But if you could handle WMV-clips really well, I think lots of people would buy Solveig just for this feature, me for one.
Best regards,
-- Kim Walden