I read this post from the RStudio blog and decided to try out the RStudio 1.2 Preview Connection pane.
After installing the current Preview version ( v1.2.1015-1 for MacOs) I find no change Version 1.1. The dialog box for New Connection has the same appearance as in 1.1, and once I establish a connection there is no SQL button to create a new sql script based on that connection.
On the other hand when I make a new SQL script I can get the Preview function to work by typing in a the full code for a manual connection.
(Note that I have to make my connections manually rather than through the dialog box, as I have so far been unable to get odbc to work.)