Unsurprisingly the new Modem has leaked on Whirlpool:
Not much of a leak when it's launching next week (note: I didn't know this).
To answer some earlier questions in this thread which are all in the linked threads etc in that thread if you look hard enough:
For existing contracted customers they can upgrade for $9 a month or $216 outright. Customers not in contract will have to pay $384 (not really worth it in my opinion unless you are desperate for the included 4G).
The 4G usage will come out of your included Cable/ADSL/NBN Allowance if that connection goes down, but will be shaped at 6mbps down/1mbps up. It will be monitored for misuse: eg if you try and use it for weeks at a time when you dont' really have a connection issue (or you take it away with you on holidays). No idea how this will be implemented, don't want to know I'm sure it'll all come out in good time.
Essentially if you are signing up to a new Telstra Broadband Contract, you'll probably get one for free anyway, but I'm doubting it's going to interest that many existing customers, at least until they switch to the NBN and need a new router/modem with a WAN port.