Abdullah Almuntassir has announced development of the next product update for Ultra Weather XP. Specifically, according to Abdullah, V2.5.2 (or perhaps V2.6) will focus on cloud size, density, and sky colours.
Check out the first WIP screenshot below.
Moreover, Diya Almuntaser also announced development (back on June 11, 2019) of V3.0 which will include volumetric clouds. However, this update will take more time to complete and there is currently no preview media.
Keep in mind, Ultra Weather XP Version 2.5.1 was released back in May.