Tamron will announce a new 150-500mm f/5-6.7 Di III VC VXD lens and this time the teaser and the first leaked pictures + specifications came at the same time:
25 elements in 16 groups
Minimum shooting distance of 0.6m (wide angle) /1.8m (telephoto)
Maximum shooting magnification of 1: 3.1 (wide angle) / 1: 3.7 (telephoto)