Tech News Rumor Insider has confirmed Yahoo! is changing its name to "!" as part of a company-wide rebranding spearheaded by new CEO Marissa Mayer.

On Monday morning, visitors to the Yahoo! homepage were redirected to !.com, a sparsely-designed website imploring users to "sign up for the beta." The redirect has left millions without access to their Yahoo! e-mail accounts.

Insiders say the name change is merely "phase zero" of Mayer's grandiose plan to reinvent Yahoo! from the ground up and inject the aging web portal with a dose of "cool," which just might be what the company needs in the age of hip startups like Instagram and Twitter. It's a risky billion dollar gamble, but it could pay off in spades.

No word yet on when the site - assuming it remains a site - will re-open, the fates of Yahoo!'s many properties (including Flickr and Yahoo! Answers), or how to pronounce the new name.