The EVE Online forum has been updated with a post from Team Phenomenon to introduce players to "the next phase of PvE content". Blood Raiders are expanding their operations with a new production facility and several new ships. According to the post, players may encounter this production facility as well as any number of smaller ships in surrounding areas.
The structure is always vulnerable, and will go through the Shield Phase with 24 hour reinforcement, and then Hull phase only (no armor phase). A repair timer will also happen for both phases, if the shipyard has been repaired then it will be vulnerable again with full shields.
They are hidden, and will only be found by following a Blood Raider Hauler that is taking part in an NPC Mining Operation.
Structure will defend itself if discovered by utilizing its own modules against hostile targets.
A strong defense response will guard the structure, including short-range and long-ranged based fleets. These fleets will re-position themselves around hostile targets should they become too far from their effective weapon ranges.
For now, there is only one shipyard for players to track down and (attempt to) destroy. There are plans, however, for Mass Tests at a later date.
You can read the full test server update notes on the EVE Online forum.