You can make Mk. 5s, or rather, a single Mk.5 suit out of the standard Tac box...more or less.
As for the rest, I think that will be the demesne of FW.
GW's theme for their marine kits tend to be eclectic; marines mismatch various pieces of armour consistently provided they're anything more experienced than basic tacticals. To be frank, I don't think GW much cares about offering consistent marks of armour; all the "new" marine kits have been their own unique thing, such as the Mk. Nipple for the BA, and Mk. Wolf for Space Wolves, and so on and so forth.
FW not only pays more attention to that sort of thing, but since they've now released comprehensive kits of Mk. 2 through 6, I doubt GW will try to release their own versions. Better to leave the niche product to the niche subsidiary company, and thus come with a niche pricetag.
The only real possibility is Mk. 8s appearing more consistently in the standard line, but again, it's more probable FW will release Mk. 8 sets when they flesh out the Minotaur Chapter, which apparently has access to higher-end Imperial equipment.
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