The Singaporecountdown to Black Mirrorhas well and truly begun.

We still don't have an official date for Season 4 of Charlie Brooker's nightmarish futurescape, but judging by the recent activity on the official @blackmirror Twitter account it won't be long now.

It started last Friday, when they tweeted out the poster for "Arkangel":

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This was followed up the next day by a teaser for the same episode:

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Then, on Sunday, we got the poster for "Crocodile":

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And sure enough, right on schedule, Monday saw the arrival of the "Crocodile" teaser clip:

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If we had to guess, we'd say all of this is building up to a release date...