One of the boxes on the mytivo website asks if you have Sky or any other DVR so there is atleast a chance cable will be supported but I wouldn't hold my breath.

I would still most likely get a TiVo HD box if it just did FreeviewHD. Since getting HD I watch very few Saturn Analogue channels with my TiVo. I just wish they would get Prime sorted. I was told that the Saturn HD via cable will include Prime in HD but then again they seem to just keep pushing out the announcement of their service. I have held off myskyhd because they keep saying their HD service is 2 weeks away, a month away etc etc... since October last year the date has slipped and slipped. I think Telstra is loosing a lot of business because of FreeviewHD and MySkyHD.