I don't know whether all of you are aware of the merger that has just taken place within the Yamaha group:

http://www.yamaha.com/news_release/2015/20151222.html
or direct PDF link:
http://www.yamaha.com/news_release/2015/pdf/20151222.pdf

The Yamaha electronics division (which included arrangers and synthesizers) have been dissolved as an independent division and merged with the general musical division.
I don't know if this is significant, but I would normally interprete this as a streamlining process that doesn't suggest expansion, but rather concentration on fewer, more profitable market segments.
Against this background it would make sense if Yamaha didn't try to release a flagship to "kill the Kronos", but rather focused on certain user groups like the young generation who like to experiment with new sounds and are particularly interested in the FM engine.
That would be very disappointing for my taste, as I have always been more interested in realistic emulation of natural, acoustic instruments (like many in this forum) and full workstation features with sequencer.