Here is the things, say we include a map preview. What are we going to do with maps that have multiple star? How would this mechanic work? People unless you can explain all of the different aspects of the mechanics and how it would affect game play just don't post them.
There is also a reason for not having map preview, sure you would say that many strategy games have map preview. I would argue this, all of those maps are 2-d maps. Sure they might have different elevations, but essentially it is a 2-d grid pattern. Sins is different the planets are in 3d even then. With those 2-d maps, they are created with symmetrical reflections. Our maps aren't.