Marchland is out on dominion.games (and it'll also be on TGG when it releases later today).
Marchland ($5, Victory)
Worth 1VP per 3 Victory cards you have (round down)
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When you gain this, +1 Buy, and discard any number of cards for +$1 each.
As the name, suspiciously familiar VP ability, and when-gain ability may suggest, this was going to be in Hinterlands 2E. It couldn't fit in the update pack though, so now it's a promo.