Atari and Nvizzio are aiming at average pc's. Windows 7 and above will be supported. The current system requirements are found at the Steam product page:
http://store.steampowered.com/app/282560/? they are subject to change as the game is still in development.
I hope the second beta will be a lot better than the first beta. On my pc, the first beta did not go beyond the menu screen, and kept crashing every time I tried to load a park. Nvizzio has stated that they will fix lots of bugs that were in the first beta, so I hope it will turn out good.
We will see, I'm looking forward to updates on development
Edit: my pc is better than the minimum system requirements, so it should run the game without problems.