Since Steam they had always had plans to renew their interface, but we had not visual proof that this change in decoration was so close. Thus, and thanks to filtration that Steam Database has been able to collect, several images have been shared that show that Valve is already testing some other changes in the Steam store and library in the coming months.
To be more exact, these screenshots come through the Chinese client update of Counter Strike: Global Offensive. As can be seen, they do not present very visible changes to the naked eye, although it does indicate a greater modernization of the interface that, presumably, will make navigation more intuitive to the 90 million active users per month of Steam. For now, Valve has not made any statement about it.