Shouting it would be ever-so rude. The mod was actually started yesterday but then I immediately hid the thread until 3AM [EST]. (I was starting it up at midnight for those on the west coast of the U.S.)
Yes, indeed this is an April Fool's joke. We wouldn't be having Cathalan here for two major reasons:
1) Jaevyn is pretty much an asshat. (This opinion statement is made solely by me and is not necessarily representative of the rest of the Deadly Stream staff.)
2) The mod has numerous songs that the mod author didn't have the rights to include (but not limited to) the following artists. Queen, Hans Zimmer, Cliff Martinez, Kyle Gabler, Marco Beltrami, and Jody Talbot.
In addition, there's major incompetence throughout the mod. The mocking the mod usually gets for the orange - on all characters both inside and outside and the oversaturated skybox - is well deserved.
There's also the spelling errors. One was even on the announcement thread.
I had to spell check the announcement above too!
But SH - what about that Gold Edition download? I thought that meant it was genuine. Did you look closely at it though? Here it is at full size.
(I've finally slowed down this GIF. This should closer to the speed that it show up as in the game but obviously, it's much smaller as a monitor.)
BTW, the read me that accompanies the file does let on that it's a April Fool's Joke.
Still wondering what it plays like even with all of the derision I've just poured on it? Check out VP's video on it.
https://www.youtube.com/watch?v=OVJrSPOWM2U
Xuul has also done live playthroughs of the mod on two of his live streams. If you're interested in having him put together a video, let him know. (Maybe he can grab the footage from his playthroughs, slap on a title sequence, and have done with it.)
Thanks for the interest and happy April Fool's Day!
Update: 10APR2016 [9;30 PM EST] - The link to the Gold Edition download now leads to my Galaxy Map package which includes the April Fool's material in a separate folder.