Just for the record folks a RIS means you are still responsible for your own seperation from aircraft, we will do our best to tell you of traffic but you must still lookout.
If flying on a FIS we will only tell you about other known traffic also receiving a service from us .
However yes you are more likely to be informed of other traffic be it in generic form ie:
several contacts observed in the vicinity of etc ....
To traffic in your 3 oclock range 5 miles etc....
If receiving a service from ATC