At the moment only if (a) your network has been uograded to the DOCSIS 3.1 technology, and (b) either you subscribe the 1 Gbps service, or if VM decide you need one to improve downstream bandwidth issues.
Not sure why you think a Hub 4 is an upgrade though. Do you have some problem with the Hub 3?
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-- Red (VM SH2 AC Beta tester) Running on 1Gbps VM service with SH4 in Modem Mode, with a ASUS RT-AC5300 router. With this setup I get Fantastic WIRED and WIRELESS Signals in my home. I dont work for VM. But I work in IT, and I know my tech. My advice is at your own risk. If you are happy with my answers please press Kudo ?