You are right of course. But it is fun to speculate. So for now let us assume it is STORMBLOOD and go with it.
It really sounds like a title. A very badass title.
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For me Stormblood would be like the rage, the fury of the fights with the blood of many people spread on the ground, in the air, and in the sea.
It would be a carnage.
The only source was a japanese trademark bot on Twitter. Someone on Reddit also mentioned that it was registered in the same timeframe as the Heavensward mark -- right before Fanfest (give or take a week).
A friend of mine mentioned this previously, but I do believe since Rhalgr is affiliated with Ala Mhigo, and commands the element of lightning; that all signs point towards a relation of the two. Storm could represent Rhalgr, and blood could mean a conflict, or perhaps stand for a sense of relation between Rhalgr and the Ala Mhigans.
It will likely have a double meaning like Heavensward.
1. Heavensward: Towards the Heavens. All the sky related content, and the flying dragons, and floating islands. And Ishfard itself.
2. Heavens' Ward: Ward of the Heavens. The 12 guards of Archbishop Thordan that form the Knights of Round Summon. AKA: The final boss of 2.0
Most likely we are looking at an abstract concept relating to the general theme of the expansion and a person with a nice nickname. Like Daenerys Stormborn. Maybe it's the white guy with the mask.
I figure it will be something like:
Storm (as in the literal sense of weather) + Storm as in a siege on the battlefield "storming the castle" and
Blood (as in bloodshed) + blood as in one's relations, particularly with regard to the throne.
I can already see it...
PATCH 4.3 NOTES
-Blitzball has been added.
-5 new hairstyles have been added.
-New fish has been added to the aquarium.
-1 new dungeon has been added.
Please look forward to it.
Companies usually register trademarks because they plan on doing something with them (or to make sure others don't do something with them). For all we know, SE might have totally planned on doing a third title. Do you know how many games go halfway into development before they get canceled, without them working on it ever even getting announced to the public? It's A LOT.
Maybe they worked on it and realized it would be a flop. Maybe they just didn't want a competitor to make a cheap clone with the name. We'll never know. I'm just saying that registering a trademark very often does mean a game is being developed, just not that it actually gets released.
In the case of Stormblood, well. It could be just about anything, but the timing fits (just before Fanfest), the theme fits with the spoiler poem, and it also fits with the notion that in 2.0 Yoshi said they want a sky or sea expansion but will go for sky first because airships and all that are such a big part of the FF universe (so the second expansion being the sea themed one would make sense). But yeah, it's ofc just speculation^^
Then again, such speculation often turns out to be true, so...I'll just stay hyped for now ;)
Future generations will look back fondly on all the rest of the future FFXIV expansions:
Ragepunch
Bonefire
Zombiefang
Grimedge
Darklord
But they sort of lost all of us at Happysparkle.