Per the history of previous expansions, the only weapons the new jobs will get for pre-DT cap levels are Lv80 poetics weapons, which will come augmented as they already are today, and Lv90 tomestone weapons, which at DT launch will switch to poetics and also come augmented. Those two additions will be enough to get your new jobs to start at the Lv83 IL and have Lv93 IL immediately upon reaching Lv90. The weapons will cost 600 poetics each.