You need to have a gaming PC within the range of these specs:
- Windows 7 SP1 or Windows 8/8.1 64-bit OS
- Quad Core CPU - 2.8 GHz Intel Core i5-2300, 3.2 GHz AMD Phenom II x4 955, or 4.0 GHz AMD FX-8350
- 6GM RAM
- Nvidia GeForce GTX 680/AMD Radeon HD 7970 with 2GB or better
Also you need to have an Origin account.
If you meet the requirements you can sign up here . Testing starts on July 2, 2015.