The Progetto C50 mod. 66 will be the upcoming Tier IX heavy tank introduced with the new Italian heavy tank branch. The vehicle has entered Supertest stages and is getting ready to be released with Update 1.11, the last one in 2020.
As far as I was able to find, the vehicle is a paper project with no drawings and only some specifications ever even considered. It will have two 105 mm guns and the top gun will be a 120 mm, all featuring the new improved auto-reloading system.
Please be aware the model is not final and all characteristics are subject to change.