They've already confirmed that primal weapons will be i90, like the +1 is right now. They also said it would be a quest to get that weapon, so likely it'll be like the relic quest was "kill boss while as this job".

What they haven't confirmed yet is if Relic +1 is getting buffed to i95 with the Allagan weapons. For that question to be answered you'll most likely have to wait until Dec. 17th.