Original series creators Joel Surnow and Bob Cochran are working together with executive producer Howard Gordon, according to THR.
If the prequel happens, we can probably expect that it holds true to the tone of the original series, even if the format and cast is quite different.
Fox is reportedly looking into developing a prequel of the 24 series, which would follow Jack Bauer in his days before becoming the badass agent we all knew and loved/feared during the original run of the show.