We still don't have the image for MediaWiki 1.27 but we are working on update it. You can subscribe to the application to get a notification every time we release a new version.
You just need to click on the
Regarding those plugins, we don't include any external plugin so you will need to install it on your own. However, we have document how to install several of the most common plugins for MediaWiki, including Parsoid and VisualEditor. Please take a look at the following documentation: