Well lets make long things short....or better not ^_^
Wing commander Saga is a Freespace2 mod set during the WC3 timeline, but willinclude other timelines...its just that our main campain is set during that time...aproxametly.
For pictures check the Forum their you will find enough of them...we also have a Aprils-fool-demo somewhere, but its totaly outdated so I didn't recommand it.
The newer demo is in WIP and Tolwyn has also posted something official about it.
If you have some more specific question fell free to ask.