Since they did a rather wonderful review of it when the original SEIV was released, I think it would be a good idea to e-mail the editors at
http://pc.ign.com and ask them if they would post a review of Space Empires IV Gold when it's released, to try and draw some new blood into the game.
For that matter, any other game review sites you can think of, that would normally review any other 4X strat game - let them know that SEIV Gold is on the way and that they can contribute to an already strong and thriving community with just a few positive words (and assure them that when they get their hands on the game, their opinion WILL be positive).
Just a thought.