Yesterday Canonical finally gave a name to their latest application center. It is now called “Ubuntu Software Store” and package’s name is software-store. It will be the major handling of Ubuntu’s overall software. At the moment packages affected by software-store are:
aptoncd, computer-janitor, computer-janitor-gtk, gdebi, gnome-app-install, software-properties-gtk, software-store, synaptic, update-manager
In the future it will grow to replace Synaptic, gdebi, some parts of the Computer Janitor, and possibly Update Manager (This is an official statement, not my opinion! :) ). However this is not going to be archived at the upcoming release, Ubuntu Karmic Koala.
To contribute to the development, you can read the official wiki.
Screenshots of the Ubuntu Software Store:
"