Short answer: Damned Heavy Weapons and Command will almost certainly be separate kits.
I have to assume that the upcoming releases will contain the same sprues released through the crowdfunder with only minor corrections to strengthen parts or fix other small problems like that, if any changes are made at all (and I can't remember any particular problems with the heavy weapons and command sprues!)
IF so, then the crowdunder had the command and heavy weapons as two different sprues, two different products.
There's a LOT of stuff on both sprues, too, so you'll be getting a lot of value out of two different kits, if that is the way they are being released (as I expect they will be).
The heavy weapons sprue contained bits for two weapons like mortars, direct-fire anti-tank guns, lasers, missile launchers, and that sort of thing, and I believe you can expect a couple of sprues of these plus a sprue of Damned crewmen too (this will be the same sprue, I expect, that will be included in a separate artillary kit, as it includes arms holding ammo for both the heavy weapons and artillary and the crowdfunder included enough crew sprues for both subjects!) The Damned heavy weapons are the same size as and fully compatible with the weapons on the Grognard command/heavy sprues, sharing similar parts, in case you are curious - the Damned and Grognard heavy weapons kitbash together really well. These heavy weapons are generic enough to be used for any of the Death Fields teams - the crewmen wear uniforms for the Damned, but a simple head swap and uniform paint scheme for your favorite DF team will be a perfectly fine and very simple conversion, as the Damned uniform is fairly generic, too (jackboots, trousers, and tunic with a breastplate over the tunic - it's a visual "blank canvas" and you can get a lot of customization mileage simply with different paint schemes!) Two weapon sprues plus a crew sprue (four heavy weapons and four crewmen, plus ammo boxes and other diorama bits) for each box sounds right.
The Command sprue includes a couple Damned human-sized figures, two males and one female in long coats, and one in a robe or smock, with bits to dress them up as officers, a mad scientist/surgeon (with medical kit, syringes, saws, etc.), and/or a psychic cultist/priest (with open book, staff, etc.) There will also be enough bits to make an ogre/brute commander in long coat with a couple revolvers and other weapons (he's begging for a cowboy hat, if you ask me, though none was included - I think I'll scratch-build one!) Two sprues per box sounds reasonable for this kit (a total of 12 figures, four of them ogre brutes), but maybe a bit light on plastic (a hypothetical extra sprue of miscellaneous bits would "sweeten the pot" by adding a little more value per box for what would othewise be a two-sprue kit!)
In case the artillary sprue is news to you, these will be seriously big guns: each sprue has enough bits for one big artillary carriage, with a couple different options for the weapon itself, plus ammo crates and other accessories. I believe the box will contain two sprues of these plus a sprue for the crewmen to operate it (as mentioned, the same crew sprue used for the heavy weapons). The artillary piece will be larger than the heavy weapons, and would be designed to be towed by the Damned vehicle (which includes a hitch for the purpose.) I don't think WGA has released any comparable product for the other teams before, in hard plastic at least. These artillary pieces are generic enough to be used by any of the Death Fields teams, and wouldn't look out of place on any historical WWI or WWII game table either. Two artillary sprues and a crew sprue (2 guns and 4 crewmen) sounds about right for this set.
Both the artillary and heavy weapons sets include more weapons than carriages, so you'll end up with a few spare gun bits without carriages - these extras ought to make for some fun kitbashing and scratch-building opportunities (to add the guns to vehicles, mount on scratch-built carriages, build into wreckage or other diorama subjects, etc.) And, of course, all of the Damned kits, including the artillary, heavy weapons, and command sprues, include extra bits that will be great for kitbashing and so on.
Anyway, in short, I expect that the Damend Command and Heavy Weapons will be separate products, they're definitely separate sprues, and were treated as separate reward options during the crowdfunder.
