As far as I know the person running the node will know your IP address and what addresses are in your wallet.
They know your IP since you are connecting to their server and know your addresses since you are asking that server for balance info.
Any light wallet connecting to a server will more or less leak that same info.
-Dave
Using TOR connection will break the link very easily, and it's easy to connect tor. In my case I have TOR active, so my Electrum do not connect if I open it without running my tor.