The bare minimum would probably be 128 MB vram, DirectX9.0c/OpenGL2.0
If the computer is made after 2007, you'll be fine. A single core processor works, but is not recommended You can download the game here and read their exclamation mark-riddled announcement post here, but I'll copy & paste some of it below just in case the site goes down. Still, if you do actually manage to get in and play for a bit you'll be able to experience lawyer-friendly locations such as Ponydale, Cantermore and the Evershade Forest, and thanks to the /stuck command earth ponies will no longer be subject to eternal damnation in Tartarus. Even now they are crumbling under the weight of thousands rushing to download the MMO's client in preparation for the big day, and quite probably things will only get worse come tomorrow.
On Friday at 12:01AM EST the Legends of Equestria open server weekend will presumably begin, provided that their servers can handle the load.
