According to an article on the Nemedian Chronicles, in the platinum issue of Wizard magazine #207, Dynamite Entertainment's Editor-in-Chief Joe Rybandt stated that there was a Sonja/Thor miniseries in the works. "It's not a crossover, but a miniseries that we'll be running some time in 2009 as well."
Intriguingly, I seem to have come across the same 3-page scene done by a different artist:
And then the 1st two pages of the sequence by someone else: