Tonight I decided to look through the web archives for an old article on the LEGO Universe website.
Instead I found this...
http://web.archive.org/web/20080223192059/http://universe.lego.com/en-us/ProgressLog/Default.aspx
Someone was invited to see LEGO Universe in December 2007...?! One week shy of a decade ago!
Here's the important bits:
Character creation never changed much, and yes, Indiana Jones's jacket was in the game even up until beta... But the author is describing the Vanguard Outpost! It has to be the earliest description of the game itself ever released publicly; the Vanguard Outpost was the first world ever created for the game. Man, 2007...!
We don't have any screenshots or video of it, but there's some small scraps left over from it even in the final game, and a good amount of concept art. You can read and see more here:
http://legouniverse.wikia.com/wiki/Vanguard_Outpost
http://legouniverse.wikia.com/wiki/Sergeant_Maxx
http://legouniverse.wikia.com/wiki/Sentinel_Guard
http://legouniverse.wikia.com/wiki/Vanguard_Vendor
http://legouniverse.wikia.com/wiki/Grumpy_Darkling
We also have some descriptions of it from concept artist Jerry Meyer... First, these news articles from May 2008, though the art featured in them is from 2007:
http://web.archive.org/web/20090322083816/http://us.universe.lego.com/en-us/newsnetwork/Story.aspx?id=74127
http://web.archive.org/web/20080628191538/http://universe.lego.com/en-US/NewsNetwork/Story.aspx?id=74149
No specific names of things were being mentioned at the time, but the "giant city" = Nexus City, and the "shard/spike" is a Maelstrom Shard. Vanguard was an early name for the Sentinel faction (and the name of the Paradox faction was Thunder back then, too).
And a more detailed description from the Imagining LU blog...
I think the most interesting thing about this world is that it's strikingly close to the tone of the final game. You could easily pass this art off as being for something in a post-launch update, Sergeant Maxx's design would be right at home in the final game... Even the logo the game had at the time was more gritty and tough looking. (Fun fact: While the logo texture for the login screen was updated several times, the texture for the shadow beneath it was not. So there's still a trace of that logo in the final game!)
In the end, LEGO Universe may have gone through a long, strange development, with several shifts in tone... But all things considered, ended up surprisingly close to where it began.
... Unless you count the even earlier ideas for an all-city game, which didn't make it that far before NetDevil found BrikWars, and decided to change directions entirely.
http://rayhawk.livejournal.com/439433.html
http://brikwars.com/forums/viewtopic.php?t=11548&p=303203#p303196