I'm not against spoilers, lol, using them in promotional materials is a good way to get people exicted about the new content. However, people go onto promotional sites and trailers in the expectation that there will be spoilers, to not expect them there would be silly, the same can't be said for the launcher.
My issue with them possibly using
Estinien for the 3.3 banner is, for someone who would be half way through Heavensward, they'd see the blood red AF1 armour with what looks like the eyes of a dragon attached, it's hardly a subtle hint.
I didn't really mind them using Minfilia for 3.2, there was nothing that really gave away her upcoming story, and it was just sorta saying "Minfilia stuff coming up!"