I'd like to point out as well (just in-case) that if you were testing on a PS3, you will apparently be send another code in the next few weeks to download the Phase 4 client to replace the Phase 3 one. So if this applies to you, keep an eye on your e-mail.

If not, just download the Phase 4 Beta Client via forums as usual for Windows PC when its announced.

(Sorry again if this doesn't apply to you)