I received this notice for the Google Writely Team last night:
In a few days, we will update your Writely account to use your Google Account registration settings.
This means you'll need to use your Google Account password when signing in, not your Writely password (if they're different).
If you've forgotten your Google Account password, just go to https://www.google.com/accounts
Google Writely Team
That will be convenient. I'm not sure what (if anything) this suggests might be brewing beyond login convenience.