There doesn't seem to be any future planning for this hub, I mean the model its based off of has been around and in use for sometime, Virgin just became adopters of it under Liberty Global.
I used this hub (albeit temporarily) whilst working and travelling in Canada, its been in use there (or an option) since 2018 possibly 2017 (Rogers in Canada where using a variant since as early as July 2017)
The reality of anything above 1Gb/s being sold on the residential level is unlikely for atleast a few years, personally wouldn't see any use for any requirment above 1Gb/s.
I would expect Virgin Media will be busy for the next few years not just rolling out DOCSIS 3.1 for Downstream use but bringing upstream bandwdith/capacity up and enabling full duplex DOCSIS 3.1.
Matt - Virgin Media M350 with Hub 4 in South Birmingham.
10 years in Technical Customer Service, Construction Trades and Administration - Now I'm a Furloughed Chef