Hi there!
Yes, we will be informing users via the Forum and/or Blog as to when Field Services becomes available. That's why we highly recommend that users and even prospective users sign up for the blog. Being a member of the Method Community is free AND informative!
Although this is all subject to change prior to the actual rollout, the idea is that current Full Blown Edition users will be able to access Field Services via the My Account tab link under the Customize tab. The shell of our App Library is already built under the My Account tab link and the Field Services App will be listed there once it’s up.
New users will be able to select the appropriate app(s) when they subscribe, or by the same process stated previously after signing up for the Full Blown Edition if they choose to install an App after the initial sign up.