While regular Gmail is free and perhaps will be, but all Google Apps are no more free. Google made some changes effective from December 6, 2012 for Google Apps users. If you use Google business email, Google drive, sites, Google calendar, and online docs @your_company[dot]com, then here is something you need to know. Google is no longer accepting new sign-ups for the free version of Google Apps (the version you’re currently using). If you’re already a customer, this change has no impact on your previous service, and you can continue to use Google Apps for free.
Google has introduced a new chat feature Discussions to Google Docs which allows multiple users to edit a single document simultaneously while having discussions. The new chat feature of Google Docs will be available in next few days for all users with personal Google Accounts as well as to Google Apps customers on the Rapid Release track.