Enigmatic hints are for 'classic' and not Day 1 releases.

Great work. :3

How do we know?

Last year there was an enigmatic hint for Anno 1503 and 1701, so both Sims games at once seem at least more likely than just the 2nd game. But anyway, I really hope it's any of The Sims.

Small Soldiers: Squad Commander

This video is not available in Germany. Unfair. :(

You could try
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But please read their Privacy & TOS.
The Firefox extension works quite well, though.

It's the Barbie Girl video clip.
Given that the clip can be shocking and it features artificial girls, my guess would be Bioshock (little sisters) :)

...or The Sims.

That's correct.
On ther other hand there are 8 weeks until the release of Bioshock Collection so maybe the hint is for these all 8 weeks ...

Another possibility (wishful thinking): Song of the Deep.
The song is by Aqua, ie literally the Song of the Deep (water) ;)

Nah, they're for anything. (example) Day 1 releases seem less likely to be uncertain though, if they're very close to release when hinted at.

Barbie is associated with fashion, so I am going to guess the most fashion-oriented game there is:

Dark Souls

XCOM - Enemy Within. XD

Aqua as in Aquaman, Barbie or Barbara Gordon, unfair amount of pain to the ears... Looks like Injustice's coming here.