I noticed over the weekend that my upcoming flight FRA-YYZ had been changed from the 763 to 333. My seat allocation was still row 12 so I phoned immediately to get it changed to 18. From my past experience, the seat re-allocation in situations like this is somewhat random, and most definitely does not recognize preferred seating.

I don't think that either the 763 or 333 bulkheads are as good as row 18 on the 777, but from my point of view, no seat in front to recline into your space and being served first make it worthwhile.