Thomson's First B787-9
According to 'all things 787', Thomson's first B787-9 is due to be built in Charleston for delivery end of May 16/beginning of June 16.
I think that confirms Jethro's comment '13 Further Boeing B788-8 options - Expected to be converted to Boeing B789-9 orders', and that the rest of the B787's being delivered to TUI group will be the '9' version.