I wouldn't expect great things from the hub3 though - lots of complaints around here about the quality of the wifi signal.
if the link doesn't work, then sit tight for a forum staffer to respond and arrange to ship one out - lots of people say that the CS desk tries to charge them for a new hub when they call up and end up waiting around here instead..
I got my Superhub 1 swapped for a hub 3 last year. Differences:
Domain blocking is gone. If you need it, you might be better of with the old hub. I now have to use my hosts file to block domains.
2.4GHz WiFi signal not better, about the same.
Supports 5GHz WiFi. Theoretically, you can get better speed, but it makes the signal (which is already not great) even poorer. So if you "force" 5GHz and you are not close to the router, your signal will be even poorer.
Only new thing I like is you can name your devices, and it remember their names, so if you are paranoid and like checking what devices are connected, it makes it a bit easier. I don't recall you could do that with SuperHub 1. Of course, if you use a PSK key that is at least 12 characters long, the odds of someone hacking/tapping into your WiFi are low.
Diagnostic tool, but I suppose it's more for customer support than for you as it doesn't really give any useful data, just which bits are working and which ones aren't, no detailed info. It tells me that all my WiFi devices have low signal and to get them closer to the hub. Gee, thanks! Alternatively, Virgin Media could make a hub with decent signal?
Other changes seem to be purely cosmetic in the interface.