The story regarding them purchasing the 744 is correct I have heard. The rationale is the purchase is a cheaper option than doing an end of lease check and reconfiguration. This way when they are done with it they can park it and walk away....
I really doubt they will pull out of the 787. The only option on the market is the A350 and that has already been delayed and I suspect there is more to come too.
The other two I have heard as well, not necessarily in those specifics but the general thrust was the same.