All this is going to be is the same thing as that all of us in the Account Migration Beta previously went through.
We were SmartThings accounts, we created a Samsung account and everything transferred into the Samsung account. We all still use the old SmartThings app, now called SmartThings Classic app. Nothing changes other than your account and if you create your Samsung account with the same email and password, it’s even that much more transparent. You won’t lose your SmartApps, Devices, Routines, etc…
We all experienced a few nuance bugs being part of the beta, but nothing was significant. I know that they addressed some of these things in the 2nd and 3rd round of Beta Testing: