The Pirates of the Burning Sea team has been posting a ton of information on the upcoming patch 1.17 in a series of dev blog entries. Changes are coming to the Auction House; ship storing and mission sharing features will be added; and a new combat mechanic called Cannon Resistance Penetration will be introduced.

The Auction House changes will introduce Buy Orders, which "let you place orders for goods you need when there isn’t anyone currently selling them," as well as make the AH cleaner and easier to use. Fraxl's blog entry explains how you’ll be able to store up to 100 ships in your nation’s capital and share missions with your groupmates, and Lum outlines all of the new set of stats cannons will have thanks to the CRP combat mechanic.

Here's the basic idea surrounding CRP in 1.17: "Bigger cannons are going to ignore a percentage of the Damage Resistance on their target. This helps compensate for the fact that larger guns do less damage per second makes them more valuable against targets with lots of resistance.