"In Bond" wines are those that are stored in a bonded warehouse and have not yet had the duty and VAT paid on them. This means they can be traded tax-free until they are withdrawn from bonded storage.
"En Primeur" refers to the process of buying wine before it's bottled and released onto the market. It offers the opportunity to invest in wine while it's still in the barrel, typically at a lower price than when it's released.