If true that's sad, such a great team and such a great Mod. I hope at least that Game Developers snapped the Team Members up, would be tragic for all that talent to go to waste.
Well, for all we know they are dead in the water, only Beppo seems to be active, making mutators for Inf (but not any official development), the rest appear to be AWOL and have been for some time.
But its hard to sift though all the gossip, theres been so many rumours about Inf beeing ported to this and that, about new mods beeing made by the Inf team, and a host of other things (including rumours that they have broken up over personal disputes), and since the Inf team themselves have allways been very secritive, and not very chatty, such rumours can run wild.
But the bottom line is: The team themselves say that nothing is certain, they have aired no plans one way or the other, and have hinted at wanting a break from mod-making for the moment.
So the honest answer is: nobody knows! we dont even know if they will make any more mods, or what they might be if they do, or what engine.. and anything beyond that is rumours and nothing more.