Altera will first use Intel's 14nm finfet process but no date has been given as to when Altera will start to get wafers. Altera has not announced its 14nm products yet and has yet to move into production of its prior generation 20nm products.
Altera has been a lead process co-developer with TSMC for several generations of process development and presumably this will now stop with the 14nm generation, but nothing has been said about that. Altera will continue with plans to use TSMC's 20nm process.
Intel currently has 50% more capacity than it can use at 22nm and has said it will spend $13 billion building new capacity this year. Altera's sign-up will help make that investment look more justifiable.