Can I offer an answer with a question? Why are you doing a press release?? Press releases don't do anything for you anymore. Build a section of your website for "announcements" in WordPress or something and post your press release there. Push it out to your email distribution list, facebook, G+, and Twitter; you'll get more out of it than putting it on the wire.
To get the press, you need a story; something more than the announcement itself. Build your roster of media contacts and call each of them with your announcement and that story - in which you have a quote, stat, or something relevant to make the story more compelling.