Oh, hey it's up on Amazon already --
two surprises -- it's in hardcover, and the cover art is quite
nice! See it at:
http://www.amazon.com/Miles-Mutants-Microbes-Vorkosigan/dp/1416521410/ref=pd_sxp_grid_i_0_1/102-9145823-4784946
I thought it was going to be a paperback. Well, it doubtless will
be, in due course.
Doesn't say who the artist is...
Ta, L.