I don't know why people are worried when Origins looked pretty damn good maxed out and this will look at least as good as that. I don't think the graphics are anything mind blowing even in the screenshots, it is just UE3 after all. Asset quality looks nearly identical they just have a load of fancy post-processing effects to give it that extra sheen.
when you have a dedicated PhysX card the games tend to run better, at least the PhysX processing doesn't interfere with the main card doin the rest like all the tessellation etc. just my preferred way to run these games.
I tried to use my old GTX 570 as a Physx card and very few Physx-enabled games actually benefited from it. I hope you will have a better time with a Physx card than me. From my experience it's not worth it.
The Batman games are well known for their advanced Physx use, so having a dedicated Physx card handle the Physx can improve your fps. Watch these two videos:
Batman: Arkham Knight is set for release June 2, 2015 i think after all this Delay for 9 months we will get a product with very high visual and graphics quality and very less glitchs and bugs
I was very pleased with the graphics in batman arkham city, so if its an improvement on that, it will be enough for me