Cherryh v2.0.2 [5b9d] Enigmatic Vault bugs/results:
for those about to attack the vault, save your game so that if the events fail to trigger you can reload. after the vault and its guardians are destroyed it should give you two research sub options in the situation log. if it fails to create these and put the research marker in the system screen you are hosed and need to reload.
for the rewards: it looks like as of now all you get is both the decoder and encoder techs at 33% researched. {out of 4 loads that is all I saw and per a previous post in this thread the event files only show the encoder/decoder tech. the other items: shields,armor, and reactor are reverse engineered from FE ships.