As time passes some D300/D300s owners leak away to more compact systems and some jump to FX. For wildlife, in particular birds, I still hold out hope for a D400 with 36MP DX sensor and 3 stops better low light at 7-8 fps. A D400 with a 300mm f/4 would be far more portable than a D800 with a 500mm f/4.
I like the size of the D300 body, I have tried holding D7000-sized bodies and they don't work for my hands/fingers. That's why I chose the D300s over the D90, and that hasn't changed, so more compact systems do not attract me at the moment.
As Steve mentions, I can also see a D800s getting me to move from my D300s. It's almost time for a new computer to handle the files anyway D4x would be just too much cash, but an 800s would do all my event and landscape as well as birds (albeit not as well as a D400).
In the meantime I will not buy any lenses either. Nikon - it's your move.