The involvement of CEPSA is what triggered the last round of "Toro Rosso will be sold" rumours. They are owned by IPIC (International Petroleum Investment Company), and Abu Dhabi-based investment company who also own Nova Chemicals and Falcon Private Bank. This investment sparked rumours that IPIC would buy the entire team from Red Bull, though it obviously never eventuated. Still, if they wanted to, they would be ideally-positioned to do it.
Personally, I think full team ownership by a Middle Eastern person and/or organisation is an inevitablity. We already have Aabar, Mumtakalat and IPIC investing in teams, so it wouldn't surprise me if, before long, we have a team competing under a Middle Eastern name and banner.