There is no Halo 4 beta or Halo4beta site

There are no plans for Halo 4 to receive a public beta, 343 Industries announced in a Q&A with franchise development director Frank O' Connor. He answered a slew of fan questions about Halo 4, revealing that it would be possible to play Grifball, that there would not be a color-blind mode (though considerations for that audience have been made in art decisions), and a few other tidbits. In related Halo 4 news, Microsoft recently won a legal battle against the bogus website Halo4beta.net, but as there won't be a Halo 4 beta we don't expect it to be put back into official use any time soon. Microsoft has also filed a complaint against Halo4beta.biz.

Source: http://www.joystiq.com/2012/03/11/there-is-no-halo-4-beta-or-halo4beta-site/#comments

I wish there was. It would have been cool

They should have made a beta. :/

Your a little late. This was announced so long ago.

Old news, but thanks for tell people that don't know!

Grr. I really wanted a halo beta.

Hi Everyone I Understand It Was Very Old New's And Most Of You Already Know About It But Not Everyone So I Thought I Would Post It So Hope You Can For Give Me Guy's

Too bad. I guess I will be just that much more excited for Halo 4.