I think it's not a future of jazz, but it's his past, I think... So why? Because there's no Eva, and after JJ2 she's Jazz's wife. There's nothing any information about Eva... She's devorced from jazz!? I don't think it... So it's the past, or an alternative time, I think. =) Oh, and there's spaz (!) too in his JJ2 outfit for a short weapon shop scene...
So, I don't really like this game, becouse there's no Spaz, Eva, Lori, Devan, Bird or any other main character... But there's Darkshell with his soliders from star wars, and it's a good idea. The main thing I don't like is the gameplay, it's similar as Earthworm Jim, but there's less things and ideas... So, as Haze sad in his page: "It's not a JJ game, but a not bad platform game" =)