Nokishita just leaked the Tamron 150-500mm f/5-6.7 Di III VC VXD and it looks like a great lens, but it is a little heavy at 1,725g.
Tamron’s “150-500mm F / 5-6.7 Di III VC VXD” has a lens configuration of 25 elements in 16 groups, a minimum shooting distance of 0.6m (wide angle) /1.8m (telephoto), and a maximum shooting magnification of 1: 3.1 (wide angle) / 1: 3.7 (telephoto), filter diameter 82mm, size φ93×209.6mm, weight 1725g + tripod mount 155g.
via Nokishita