like a fine single malt, the DLC is almost done... we hope to be able to take the wraps off it this week

The DLC might not be what you're expecting, according to a previous tweet from the same official account.

testing the DLC over the weekend... it's probably not what you expect, but we think the true Metro 2033 fans will love it...

In any case, we'll see what 4A Games has in store for us when the DLC is revealed, which could happen this week.