Looks like we may soon be getting more things to buy using samples and requisition slips. The Catalog Expansion has no cost, and buying it does nothing. The Upgrade Effect text must be null for Catalog Expansion, that field just shows the effect for whichever upgrade was previously selected.
Edit: It's been acknowledged on the official Discord, looks like it's unintended:
ALERT: ROGUE ITEM DETECTED. The Ministry of Truth has confirmation that a rogue item called the "catalog expansion" is temporarily visible in the Ship Management menu and, in accordance with regulations, we instruct all Helldivers to avoid this rogue item until further notice. The Ministry of Truth cannot confirm the reliability or safety of this item, nor can they confirm its origin.
Honestly, exterminations are a joke mission on higher difficulties. With two people, you fight untill the map is full of enemies (and it will be). Then you throw the 380 and the smaller artillery, and orbital lasers after. With two people, it either gets you 100% or very close to it. Easiest mission in the game lol