HiCan i use the gtkradiant 1.5 for maps? Or is this a other Version?
No. RIK has it's own radiant, but it's very similar to gtkradiant.
There's a custom map editor based on darkradiant (much like gtkradiant) that comes with the game. Map files made with gtkradiant won't work. :)
E: I was too slow :(
Ok then I wait times looking forward to the game!