Over the past editions, the presence of Heavy Flamers in the Space Marine codex has gradually increased, from being on Dreadnoughts (including Tactical Dreadnoughts) only, to being takeable on Sternguard and Damned Legionnaires and twin-linked on Razorbacks, and if the Kit Bash article in this month's White Dwarf is an accurate indication of the Codex and not just a chap putting a heavy flamer in his Tactical Squad because it looks cool, then they can now be taken in Tactical Squads as well.
If Razorbacks can take twin-linked multi-meltas, well, Battle Sister squads and their dedicated transports will be left scratching their heads and wondering what happened to all their unique toys. Especially since they got them by forsaking plasma guns, plasma cannon, lascannon and missile launchers.
So let's all put our crazy heads on and pretend that Sisters are actually getting a release some time this decade.
What new weapons might we see on the plastic Battle Sisters frame?
I doubt they'll get any of the things I mentioned in paragraph 2, or grav guns, but maybe some fantastical "new" Ecclesiarchical thingamubobby that wounds against Leadership like a neural whip / shredder does.
I also envision some kind of incendiary missile launcher - maybe one that fires a swarm of micro-warheads - but I'm not sure how to stop such a thing from completely eclipsing flamers.
A thought? Anyone?