I don't think this was anything we didn't assume already, but nice to see some confirmation:
http://www.engadget.com/2013/09/12/ps-vita-tv-can-technically-support-ps3-games/
Via Nikkei:
http://techon.nikkeibp.co.jp/english/NEWS_EN/20130912/302940/
We know that the PS Vita TV will play PSP, PSOne and Vita titles, and will even (eventually) be able to stream PS4 titles once both devices are on sale. But how about PS3?
Andrew House, Sony Computer Entertainment CEO, explained in a round-table interview that the tiny streaming set is "technically" capable of supporting PS3 titles through the same cloud-based streaming that will bring PS3 titles to its successor. It makes sense, (if it can stream fancier games from the PS4, titles from console iteration no.3 should be a cinch, right?) but it's the first time we've heard that Sony is considering it.
We're hoping the feature eventually makes it, if only to make amends for the confusing backwards-compatibility saga that the PS3 previously suffered.
http://www.engadget.com/2013/09/12/ps-vita-tv-can-technically-support-ps3-games/
Via Nikkei:
House: The "PS Vita TV" is like a small set-top box (STB) that allows to play various games. It is connected to a TV via an HDMI cable. With the PS Vita TV, it is possible to download not only games developed for the PS Vita but also games developed for the first-generation PlayStation and PSP via the Internet.
In the future, SCE will offer games developed for the PS3 to PS4 and PS3 by using a cloud-based game distribution service. Technically, the PS Vita TV can support such games. Therefore, SCE is considering providing PS3 games to the PS Vita TV by using the service in the future.
In addition to games, web browsing and e-mail, the PS Vita TV supports video distribution services, flat-rate music distribution services and electronic book distribution services.
http://techon.nikkeibp.co.jp/english/NEWS_EN/20130912/302940/