The forums are abuzz with the potential replacement, but here's my take: it might not happen next week, maybe September, after the supposed mirrorless announcement.
Even if it is next week, the D4 will probably get first pickings to enforce the big brother/ little brother relationship. When it does arrive, it'll probably be £2499 RRP, and remain there for the first six months at least, as no Nikon has ever been less expensive than the model it directly replaces, whether lens or body. There's a lot of wishful and fanciful thinking on the other forums at the moment... We'll see, I suppose.
Still, the D700 is all the camera I could want or need, and there's no point holding out for a replacement on the off chance; life's too short!