I have a website at WordPress dot com, and I am signed up to receive email updates on the latest developments.
I just received an email headed ‘Import Your WordPress Site to WordPress.com — Including Themes and Plugins’ that says
“WordPress.com customers can now copy over everything from a self-hosted WordPress site — including themes and plugins — and create a carbon copy on WordPress.com. You’ll be able to enjoy all the features of your existing site, plus the benefits of our fast, secure hosting with tons of features, and our world-class customer service.”
The advantage of hosting a site on WordPress dot come is that Automattic (the company that owns WordPress dot com) looks after security.