As preordained, Secret World Legends is finally coming to Steam in but a few short days on July 31st.
Strangely enough, considering the fact that there’s technically four different versions of Secret World (Steam and Non-Steam versions of the old and new game) there are a few caveats. Fortunately, there’s a solution no matter how you want to play. If you bought the original game on Steam and want to continue playing the game through Funcom’s client, then you’ll have to transfer your account, but you’re good to go otherwise. You should be good to simply log on and go no matter where you are. Steam version of the game will use your Steam account and the Funcom will use your Funcom account, and everyone plays on the same servers.
You can read the full FAQ for more details.