• I think Elop's "trash-talking" of MeeGo is being expanded on by news media; rather than what he actually said. (Counterpoint: Rich Green leaving)
• I think Nokia's stock price would take a real dive if they publicly said they weren't releasing a MeeGo device. (If they released a high-end WP7 phone sooner than expected and as part of the announcement, they could use a line of "we did this faster [see how good the time-to-market can be?] so do not feel the need to confuse consumers with a MeeGo device")
• I think they'd have a retention issue if they canned the work of all the people who've been working towards the Harmattan device(s).
• The sunk costs at this point must be very high.

Nothing massively compelling, though.