“What is the difference between OS X Mail 7 and the currently shipping version?” Fairer Platform asks.

“As of this writing, not one heckuva of lot,” FP writes. “However, a Fairer Platform informant has provided some details about what to expect in OS X 10.9 Mavericks Mail 7.0:

• Reply to email with Notifications
• Search for attachments, more
• Share Passbook passes
• Focus Smart Mailboxes on specific accounts

Read more in the full article here.