There are never, not ever (and did I mention not ever) multi-ride deals between parks and manufacturers. It just doesn't happen. Not ever. A case could be made where a company like Six Flags might buy in a year three or four Impulse coasters from Intamin or Deja Vu's from Vekoma (since they obviously have), but to ever suggest that a Cedar Point or Busch Gardens has a deal with anyone is absurd.
Ask yourself: Do you commit tens of millions of dollars to one manufacturer when you don't know what market conditions will change? Cedar Fair's CEO has flat out said in an interview on this very site that the third and subsequent years out have to be flexible in long-term capital improvement plans to adjust to market needs and economic conditions.
These stupid contract rumors are the result of kids who have too much time on their hands who think that if they talk about it enough it'll come true.
Or it might be the Lemon Chill(TM) guy.