Thing is though, the Craftworlds have always had those different themes (hell, even to the point of distinct sub Codexes at one point). The Guard Regiments and Ad Mech FW is somewhat surprising, but not indicative of anything about us. What about the DG? Can't recall them getting a bunch of 'faction tactics' either.
Of course DAs will get thier 2 wings, but I doubt it'll be via faction tactics (as that would make mixing DW/RW with regular Green Marines rather tricky). As for BAs, the Flesh Tearers are just like the BAs, but a bit madder, hardly a major crunch worthy difference, and certainly none of their other successors are distinct enough to justify a distinct faction tactic. As for Space Wolves, OK Wolf Lords have their foibles, but it's not severe enough to justify a distinct Faction Tactic. OK, Ragnar likes his Blood Claws, but Codex Marines didn't get an '8th Company' faction trait either. Are Ragnar's men as distinct from Logan's as Iron Hands are from White Scars? That's the level of distinction we're taking here. Also, Company tactics would likely mean no 'Chapter Tactic' for SWs as a whole. Do we need that level of 'special snowflake' and all the baggage that goes with it? We're a Marine sub faction already, expecting a bunch of sub-sub factions doesn't seem realistic (or desirable, imo).
Stratagems themed on Companies' preferred MOs, on the other hand? That's far more likely imo, to the point I'd be surprised if those don't feature in the Codex.