The TiVo Premiere Netflix App does show which Titles are available in Super HD.
According to a few reports TiVo Premiere does support Super HD even though Netflix does not list it.
The Roku 2 XS 1080p Netflix App does not list Super HD availability in Titles. The current Roku Netflix App looks like the old TiVo Neflix App.
*Note: Although some Super HD eligible Roku devices do not currently display the Super HD logo, we continue to provide Super HD video quality for these devices.