Point of clarification: I believe Django Advent is the site that is hosting articles about the forthcoming Django 1.2 features (like messaging in this particular post), and is not the name of a feature within Django. (Even though the title of the post and its context on HN might make it look as though it is).
Actually, we (Django) are moving to a release schedule based around the church calendar. I'm looking forward to the three-day release cycle for Django Easter, and all the i18n work we'll get to do for Django Pentecost.
Sounds like Django Advent will allow someone to write a Django-based CRM system. among other things.