Um the nearly all of the variants are generally just how powerful the weapons are and colour schemes, there's no changes to how they look, so mega may not use the advantage of colour scheme changes - people complained about the cyclops after the first wave of them because they've basically just kept changing the colours and weapons. So I'm going to expect one of every new vehicle with maybe an extra warthog here and there.
It's important for collectors and displays, to have multiple variants. If not of anything else, then at least the Covenant + Swords of Sanghelios variants of vehicles.
Or perhaps use some of these SOS-themed vehicles as an excuse to re-release. (I personally want a new phantom, because the old one I can only find for $240+, and the phantom is my favorite vehicle), the Swords of Sanghelios phantom is a good reason to release a new phantom.