Could it be? Could it be that new things are the new old things and old things are the new, new things? It could. This is what John Carmack has to say about a Quake 5."We are at least tossing around the possibilities of going back to the bizarre, mixed up Cthulhu-ish
Quake 1 world and rebooting that direction." That's right. But why?
"We think that would be a more interesting direction than doing more Strogg stuff after
Quake 4." Certainly, what could be even more interesting would be an entirely new, not already tried direction.
Source:
Eurogamer