Directly to the rumors, please take with salt.
6th ed codex will be hardback
and i didnt see a named warsmith, only the dark mechanicus guy
ill say this there are havoc's for marked legions
though each legion will get something unique to them, from force organization to individual units to hqs, for example night lords n world eaters can only have 1 heavy support but get other boni
remember huron has quite decent kit, so expect something like a 2nd ed list for him. also, in some ways picking a legion will restrict you, there are allot of chaos characters already in fluff so expect most to return, plus a few new faces