CCP Rattati recently released some conceptual reskins of existing art assets for Minmatar and Amarr HAVs and Large Turrets. These are intended to be used as placeholders so Amarr and Minmatar HAVs can be added to the game and balanced appropriately, with the intention to add proper Amarr and Minmatar art assets when resources allow for it.
There has been no discussion on when we can expect to see these variants added into the game, nor if it is a priority over other vehicle-related balance/design goals.