“You’re too late, we are everywhere.” was a good place to end season 3, we’ve only touched the tip of the changelingberg. The ptb however will again try to shake up DS9 (adding the Defiant was their attempt in S3) by adding Worf and making the Klingons the enemy, and giving a lot of Klingon-centric episodes all of a sudden while at the same time throwing a lot of uh, space battles into the mix.