Dominaria Spoiler Digest - Who's Who and What's What from the Release Notes
Imprint — When Duplicant enters the battlefield, you may exile target nontoken creature.
As long as a card exiled with Duplicant is a creature card, Duplicant has the power, toughness, and creature types of the last creature card exiled with Duplicant. It's still a Shapeshifter.
6/8/2016 If no creature card is imprinted on Duplicant, it has its normal power, toughness, and creature type.
6/8/2016 Duplicant’s base power and toughness change to the imprinted card’s power and toughness. Counters and other effects that modify Duplicant’s power and toughness still apply.
6/8/2016 Abilities that define a creature’s power and toughness apply while that card is in exile, but abilities that add or subtract from it don’t. For example, the ability of Battle Squadron applies to determine Duplicant’s power and toughness, but the ability of Werebear doesn’t. Duplicant’s power and toughness are constantly updated if the exiled card’s power and/or toughness change.
6/8/2016 Duplicant keeps all creature types it had when the card was imprinted, including any types that Duplicant had gained.
7/13/2016 If a melded permanent is exiled by Duplicant’s triggered ability, that ability’s controller chooses the relative timestamp of the two meld cards. Duplicant looks at the information of the one with the later timestamp.