You can do this (sort of). If you go to the File->Project Settings menu you can put in a new base URL then open up a folder containing your Wordpress URL and do some basic Live Development with CSS on it. But you'll have to host your own server (using something like WAMP or MAMP) to get it to work. Edge Code doesn't support serving up PHP files.
There is an extension though that lets you serve up PHP. I'm not sure if it works with Wordpress but it might be worth a shot - https://github.com/AboutWebLLC/brackets-PHPServer
Thanks Ryan, I tried the extension, which allows me to use localhost as the base URL, sadly it comes up with a LIVE PREVIEW ERROR- Unable to load the Live Development Page. And the Browser displays a blank white page.
If anyone has a work around I'd love to hear it. Edge code is such a great environment to work it , it'd be fantastic to be able to work on wordpress with it.
although I Just updated to the latest version of edge code. and now it opens on index.php, but still says it cant open live preview (altyhough it is open and working) however when I click on other files to edit, it seems to confuse things ansd the preview goes to white.
The problem seems to be that live preview was built to work with static HTML files. This seems like an odd choice, considering current industry trends, but I suppose there's a market for people building static sites with a text editor, otherwise the feature wouldn't exist.
That said, for those of us working with CMS systems, Live Preview is essentially useless. Sure, I can set a Live Preview Base URL, and I can also create a dummy index.php file to effectively preview the site, however the moment I attempt to edit any other template file (say header.php), the preview breaks and it must manually be set again.
Ideally I'd be able to define a base URL for preview and Brackets/Edge would simply pipe all my CSS changes to the browser irregardless of what page I'm actually viewing. However, I'm not sure that this would be possible with the way preview is currently implimented.