It is a teaser of a problem.
They are called political teasers.
Perhaps solutions will be found to teasers such as how many commissioners each member state can have and balancing qualified majority voting against unanimity and the veto.
It seems to me "a teaser".
Here is a real teaser.
In the teaser, a song of the group (at this time the name was not revealed) was playing at the background.
On the next day, the second teaser photo was unveiled, followed by a video teaser.
The teaser gives equal importance to family, tradition and romance, with all the important characters getting a decent exposure in the promo.
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