While new siege maps look interesting, they're godawful. I realize most map makers try to make their forts ridiculously big, but making run from attacker spawn to the flag last around 4 minutes is pretty bad (especially considering rounds take 20 minutes).
This ridiculously big maps have a side-effect of making attackers just shoot it out with defenders (since noone enjoys spending bigger part of his playing time running) and leads to the usual dull gameplay most of the NW siege servers have.
Also, on siege beta server random plains are in map rotation.