It's becoming apparent that the Lucasfilm continuity guys aren't doing a very good job of keeping track of these. The official site's use of logos to designate eras only adds to the confusion. Logos are used to represent organizations, not periods of time.
So we have to look at these logos, see how they've been used in the movies, and come to our own conclusions. I've come up with the following:
As Kaal-Jhyy has pointed out, this is for the new "Legacy of the Force" era. However, it looks like a precursor to the rebellion lego, so it might be a Jedi logo from before the purge. A shame it was not used on the Jedi starfighters in Episode II. So is this a "Jedi" logo? Maybe.
The official site used to use this as the logo for the Sith. I have to wonder if a secret society such as the sith would even have a logo.
Alternate sith logo. From http://starwars.wikicities.com/wiki/Sith, this appears to be a logo from the old Sith Empire. I don't know if it's cannon or not.
Separatists, or more specifically, the Confederation of Independent Systems. Odd that this logo was not seen on the separatist forces in Episode II.
Seen on Episode III Jedi fighters and Republic Star Destroyers. Anyone care to take a guess on this one? I say it's the logo for Republic Space Forces.
Comments?