We recently got to know that Samsung might be coming on-board with Google to optimize TouchWiz, and a new news has added more credibility to this rumour. As per ITHome, Samsung will be concentrating more on user experience enhancement with the Galaxy S7, while Google engineers will help the Samsung backend code on its popular customized version of Android.
The report also says that Samsung and Google's primary goal is to make a "a non-delayed operating experience", one with "superior fluency than iOS". Now, Android has got huge market and is probably having more support on high-end devices when it comes to general fluidity. In the recent times, given how Apple's updates to iOS continue to bring new issues (especially as they try to make the OS more flexible), it's not clear if Android will ever be as optimized as the iOS.
The Korean tech giant has already attained a significant level of optimization with the Galaxy Note 5 and Galaxy S6 edge+, and it would be super exciting to see TouchWiz become even more efficient in the future (it would also be great to see Samsung solve the issues pertaining to multitasking in high-end devices). The report also establishes that the microSD slot will come back with the Galaxy S7, though at this very moment things are quite hazy. We'll wait and watch!