Large police "motorcade" on Melb freeway this morning - any ideas who?

[MrZ]

So I was coming back from the airport this morning at about 7.30am and police were making everyone on the entry ramp wait until this motorcade (consisting of about 8 or so vehicles) had gone past. Vehicles weren't anything special - no limos, just a few Genesis SUVs, a Hiace bus or two, etc. Police were following and making sure everyone behind on the freeway kept their distance and couldn't pass by. I followed it to the Langham Hotel in Southbank. Must have been someone very important, any idea who?