Red Bull will not release Vettel for the Abu Dhabi tests
While he will leave Red Bull at the end of the 2014 season, Sebastian Vettel will not be released before the end of his contract and will therefore not take part in the Abu Dhabi tests with his future team, presumably Ferrari.

Sebastian Vettel will leave Red Bull at the end of the season but will not be released earlier from his contractual obligations, particularly to drive with his future team during the Abu Dhabi tests, which is expected to be Scuderia Ferrari.
The leaders of the Red Bull team made it clear that such a possibility was not conceivable. Thus, Dietrich Mateschitz stated that the four-time world champion would honor his contract, which runs until five days after the Abu Dhabi Grand Prix, and would therefore race with his next team only when he becomes free.
The co-founder of Red Bull also explained that Sebastian Vettel had been excluded from work on the 2015 car to prevent information from leaking to his next team. Sebastian will be treated the same way and will have the same equipment as Daniel [Ricciardo] during the final races. However, he will have no information on our developments for 2015.