I have expanded the possible types of ruins in v2.6 from five to ten. They also have slightly more descriptive names, such as Abandoned Installation, Ruined City and the very useful Deserted Intact City.
In addition, the precursors did have a jump gate network and some of those jump gates remain. Therefore there is a possibility that newly discovered systems may have the occasional jump gate. Of course, there is no way for the player to tell if this is an ancient jump gate or one created by a more recent civilization.
Finally, I have changed precursors to represent a wider range of lost civilizations so there will be several different precursor races and some of their ships will be lower tech than before. Precursors may also have their own gravitational survey ships that will begin surveying if disturbed. They will automatically probe new jump points and survey new systems, just as a player race would.
Steve