Who's Buried in Newly Discovered Alexander-era Tomb?

Could this elaborate  tomb hold Alexander's mother,Olympias,or his wife, Roxana? Archaeologists believe it must hold someone very very important because the tomb is so magnificent.

According to the BBC, the tomb includes "two magnificent caryatids.  Each of the sculpted female figures has one arm outstretched, presumably to discourage intruders from entering the tomb's main chamber."  

The site is located in ancient Amphipolis, a major Macedonian kingdom and dates back to the 4th century.