Is this a sign that things aren't as cosy between Mozilla and Google anymore? I thought that development raced ahead with Firebadger whilst Thunderchicken was left to fester because Mozilla's sugardaddy didn't like the idea of mail clients stealing the limelight from gMail.
Then along came Chrome and then Chrome OS, so I can see Mozilla no longer being the favourite nephew and getting all the love. But that does mean they can start singing their own tune again, and start a proper email effort, this time properly incorporating Eudora.
Also, Mozilla Corp are a for-profit company who pay their bosses fortunes. They're not going to put efforts into an email app for the love of it. They have some kind of business plan here - They think they can make millions from email clients. But how?