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If I may ask how is the terrain? is it very open of is there a lot of terrain blocking LoS and are they still played on 6x4 tables?

The Nova Open uses terrain mapped out like this:

http://rhetorical40k.files.wordpress.com/2013/02/nova-terrain.pnghttp://rhetorical40k.files.wordpress.com/2013/02/nova-terrain.png

The center piece is both large and LOS blocking. They do an excellent job of making sure that tables are 25% covered.