Specialist slots...hmmm...
I caught one late Knowledge virtue that improved the yields of Academy and Manufactory improvements. I assumed those those are late game buildable tile improvements and some icons in the tech web support this (the improvement unlocked by Cognition could be an Academy), but maybe Firaxis is reconsidering Great People.
Or they have specialists but no GP like Civ2 or SMAC. If this is the case I hope they have really good yields to justify the opportunity cost of working tiles, especially with the leaf tech yield bonuses for some improvements.
The version can't be that old. They said very early that there are no Great People, and the tech web has proper icons instead of the FPO placeholders of earlier screenshots.
And that dithering unit glitch is and has always been in Civ 5. I am willing to bet a bottle of whiskey that it will still be there in the release build of BE.