The indus valley civilization starts around the same period as this city ended. There are no connections found YET, but there very well may be.
To me, the Indus valley people were Dravidian speakers - I base this on the presence of Brahui speakers amongst Pashto speakers in what is now Pakistan.
Keeping that hypothesis, it looks like speakers of an aggulatinative language family were spread from what is now south india along the coast of India to the indus river system, to Elam, Dilmun and Sumer and probably related to the Hurrians/Georgians.
I would like to read sources for this - linguistic, historical, etc. It could be helpful to some work I do.
Do you have any links, resources about these relationships? I would be very interested.