Interesting discussion.... I would have thought that so far as orders by FCA, TOM or TUI are concerned they are being treated as separate discrete entities for now.
Also there has been no discussion of a fleet contraction. In fact I believe TUI travel was quoted in the last press release on the merger saying it will have 23 787. By my calculations that would include the current lauch options FCA have and the "undisclosed" order that TUI AG placed for the 787 sometime this or last year.
As the press release would indicate one would expect the FCA order to eventually come within the scope of the new TUI Travel PLC order. But I fear that seeing as Tflys own MD didn't know about the merger before the announcement I can't imagine that Tui Airline Management will have consolidated any aircraft orders just yet!!
Plus the takeover of LTU by Air Berlin now presents a quandry for the German market. Currently the TUI Long haul is provided mainly by LTU in Germany but I doubt this will continue for much longer.....watch this space.