Looks like a sequel to Codename: Kid's Next Door might be happening.
A teaser site:
(the password is Galactic)
The countdown is counting down to April 1st. I know that sounds suspicious as hell, but the head artist of the show drew the design for teenage Numbuh One in 2012 on his blog, and has been dropping hints about this.
Also they have the voice actors back, so this is looking juicy.
(The coded language reads "COUNTDOWN HAS BEGUN")
Inputting names like Numbuh One, Numbuh Two or the Delightful Kids from Down The Lane gives back secret messages which you can see a list of here