New metal look of OnePlus One? A back cover or protective case?

OnePlus has just unveiled a teaser which is shown a table of elements. May be a new metal is coming very soon but what is exact its metal?

Some commenters believe it mentions to a new metal back cover for the OnePlus One might be launched.

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We now have limited number of Bamboo style swap cover in Phi and in China also has a wicker version, could a metal choice be next? But many of them will think of how much difficult to be install and remove its compact metal cover? So, we might see a protective case or a new accessory of OnePlus One.

Tomorrow OnePlus will announce its message, so don’t be too curious, it will come and we will let you know soon.

Source: OnePlus One