Ricciardo said it would be no problem and Newey said he'll be easier to fit into the car than Webber.
Source:
http://www.auto-motor-und-sport.de/...-vertrag-fuer-mindestens-3-jahre-7679907.html
And apparently it's at least a 3-year contract.
I thought it was kinda strange Newey compared him to Williams taking Damon Hill in 1993. He didn't really work out too well for them - he under-performed his entire time there, they even told him mid 1996 that they wouldn't be renewing his contract, despite the fact that he was winning the championship...