Hi Giulio,
We do not plan on offering a cloud version. However we do offer collaboration features that can be helpful in your case.
If you need a way to work in a team on the same project, then you can use version control integration to do that. Check the article about sharing projects across multiple PCs for more details.
It's also possible to share your wireframes with your client using an online service that we are providing. See the article on how to share wireframes online for more details.
Let me know if you have more questions.
