If the circles are relatively close together in time
The circles (assuming that more than one could be plotted, which now seems in doubt) would be 60 minutes apart, because that's how often the satellite pings the aircraft.
The only deduction that could reasonably be made would be if the spacing between two successive rings turned to be equal to the maximum distance that the aircraft could fly in an hour. Then it would follow (as previously suggested) that the track must be along the radius of the rings, but of course that doesn't identify which radial.
If two hourly rings are spaced closer together, then it's hard to see how anything can be deduced in respect of track or groundspeed.
But as it seems that only one ring is known, it's all a bit academic.