I've heard that only some of the original Iron-Core sets would be reprinted by Wargames Atlantic, but I don't think that was an official statement directly from anyone in the know, just a rumor, and I'm sure a lot depends on how successful that line is: if there's enough interest, who knows?
I think I'd be interested in vehicles, but I think I'm with Brian on being a bit more interested in smaller, table-top skirmish-friendly vehicles like small walkers, bikes, exo-suit/power armor, small combat/support robots or drones, scout cars, and perhaps an occasional IFV/APC, rather than actual main battle tanks, but if WA can make a full range of things including things I'm not interested in like larger walkers, tanks, helicopters, jets, and so on, then godspeed and good luck!
Iron-Core's vehicles were quite nice, and I'd hope for something in that style, rather than the chunky, exaggerated style that GW mostly does for 40K APCs and tanks, as a personal preference, but I'm probably not the target audience, and I don't think I'd buy many medium and large vehicles myself.
Really, to me 28mm tabletop vehicles like drop-ships or IFVs or gun emplacements are more like scatter terrain or scenario objectives, similar to buildings: Protect/Defend the Command Vehicle, Destroy/DeFend the Gun Emplacement, Raid the Arms Depot And Get Back to the Extraction Vehicle, and that sort of thing, if they aren't simply there to represent battlefield wreckage that provides cover or blocks line-of-sight.
So, in the sort of gaming I'm likely to do, there probably wouldn't be more than one or two such vehicles on a tabletop at a time, and things like battle tanks, jets, or helicopters might be a bit much.
To me, that sort of thing might be better suited to a smaller-scale gaming - 1/144 scale or 10mm or something.
Of course, it's a YMMV sort of thing - there's bound to be gamers with the money and space for massed 28mm tank battles and that sort of thing, and they might be a big part of the gaming miniature market for all I know!
For whatever it's worth, Archon Studios is currently running a "Rampart Terrain" Kickstarter that, in addition to some 40K-style wargaming terrain, includes some 28mm injection-molded plastic sci-fi vehicles and figures - last time I looked, these included some bikes, a tank, and (if the pledges get high enough) a 4-legged walker, which look similar to GW's stuff in style, along with some soldiers that look like they might be similar in proportions to, say, Iron-Core. I will likely sit this Kickstarter out, but my experience with Archon Studios has been positive, and it looks like it's a great source of tabletop sci-fi terrain and vehicles.