Hi Guy, this season should be no different to the 2011 season in which Investec ran their tipping comp. Investec didn't sponsor the Australian Super Rugby Conference last year, but they were still the naming rights sponsor for the New Zealand Conference and as a result they still ran the Tipping Comp.
2012 is essentially the same, FxPro sponsor the Australian Conference and Investec Sponsor the New Zealand Conference. As far as I know they should still be running the comp with all your old details included.
Over the last few days the Investec website has been down numerous times due to them working on the site, and they now have current Super Rugby news stories being added to the main player page once logged in.
My guess is they will send out an email in the next few days. For the 2011 season the "we're back" email didn't go out until the 27th of January so they're not too late at this stage.