It should be the same iLvl as the primal weapon, released along with the initial patch, and have an upgrade item from the 2nd savage fight (if it's released during an even patch)
This wouldn't invalidate the raid weapon (which would still be 5ilvls higher), while the upgrade would still require some effort.
The primal weapon wouldn't be invalidated because it's a choice of getting a weapon quick, or grinding for one.