Mine does it to. I removed the speedo to see if I could seal it better but its a non servicible item. It actualy made the black background start to orange peel a little.
I have an 07 RK and my speedo fogs up too. Primarily on morning rides. It usually burns off in the afternoon, but it leaves a residue on the inside of the glass. Unfortunately I don't know of a fix for this, hopefully someone here does
If you conducted a search on this thread of this particular problem you would get a thousand hits. This problem is all too common I am afraid and unfortunately there is not much you can do about and nor will your local dealer help to solve the problem for you.