There are people running it on average rigs, FPS problems in Olisar (test universe) are server side not local, you will notice a huge bump when running other modes such as Vanduul swarm.
If you can run the game now in it's relatively unoptimised mess form then you'll be able to run it at release. The key factor is what resolution do you want to run it at and do you need >60FPS, personally I don't as I have a 40" 4K 60Hz monitor. Personally I don't think there's a GPU out right now that can run most games at 4K/60FPS consistently so in my case I tend to drop to 1440P with a GTX 980.