As for VPs, they seem fine either way for me. And Niefelheim can consider that summer solstice is important as it is the time of the greatest strength of sun's heat which should be combated so that it won't gain absolute domination (reverse of actual beliefs of many cultures)...
As for maps, I'm for continent exploration, though reverse World of Geometry could be fun, too - at least for novelty. (Another thing - please, no toroid maps!)
Also, I don't think it's possible to hide VP provinces from players. Gandalf can say with certainty, I think...
