The lightning flashed out from the black clouds.

乌云中电光闪闪。

《新英汉大辞典》

Why do the roiling, black clouds of a thunderstorm produce lightning?

为什么滚滚的天雷，黑色的暴雨云能够产生闪电？

youdao

The last message from the pilot was a manual signal at 11pm local time, in which he said he was flying through an area of black, electrically charged clouds with violent winds and lightning.

在当地时间11pm，飞行员发出了最后的信息，这条信息是手动发出的，声称他们正在飞越一个有着暴风和闪电的带电黑云。

youdao

The dead were all members of the Army's Task Force Lightning and comprised four Black Hawk crew members and 10 passengers.

CNN: Bombers kill 4 Iraqis, injure 11 GIs

So, when we see the black bezel of a certain proportion, the rear-facing camera, the lightning connector and speakers on the bottom, it is fairly likely that they mirror features that will be part of the eventual device when it is released.

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