We support live preview for markdown and are investigating support for html as well ( https://github.com/Microsoft/vscode/issues/12080 ). Extensions can also provide their own live preview implementations
fantastic support! looking forward to it. VS Code is the new de facto IDE.
One killer feature might be something from LightTable, where you can highlight a chunk of code and see the output printed on the same page without leaving it.
That's probably one of the last features that makes LightTable valuable but VS Code is killing it! I ditched Atom and SublimeText as well.
If you have suggestions or ideas for a live preview, please file a feature request: https://github.com/Microsoft/vscode/issues/new