You can read the unedited Indy 4 set report here. And don't be afraid of SPOILERS as they appear hidden. The report also comes with quite a few revealing set photos which you can view at the Indiana Jones 4 Blog... and thus be SPOILED!

Have you been up all night like me just sweating about what is going on in LA with Jones IV? Well, wonder no more IndyFans!

Looks like Jones IV is filming on 4 stages over at Spielbergo’s home away from home, Universal Studios & security is tighter then Belloq’s pants! One of the code names for Jones IV is “GENRE”. If you are going to a Universal Studio Tour, don’t expect your tour guide ‘Babs’ to talk Jones either. Its like the thing ain’t even happening! Hush! Hush!
But…. so what is going on?
SPOILER: [ Well, there is a pyramid set. What’s going on at the pyramid set? Lots of soldiers (maybe Russian) coming out. That’s about it. ]

There is a street at Universal called [ “Mexican Street” that whenever I see it, I think of all the great scenes from Three Amigos that were filmed there…. but yes, Jones has taken over Mexican Street. ]

So where else is Jones IV filming? A place called Downey Studios which is a former airstrip and a place where several space shuttles were built! Recent flicks like Spiderman, Terminator 3 & Austin Powers all filmed there.

And as seen as if you were walking into it, like I do in my dreams. Word on the street is that [ lots of Russian lookin’ tanks have been comin’ in & out of here! ] What is going on!? And how can I get in there!!!

An edited & extended version of this anonymous Indy 4 set report can be found at Harrison Ford Web. BEWARE for those same revealing set photos though!

And the info that Spielberg and crew are filming scenes for Indiana Jones 4 at the Downey studios was already mentioned by Variety.com last week. In an article entitled Bases harnessed for double duty Variety talks about the US film industry creatives enjoying military collaborations;

... such as Steven Spielberg and company, who have set up camp at Downey Studios to film portions of the latest "Indiana Jones" movie. The former NASA/Boeing site where the first four Space Shuttles were built boasts a cavernous 627,000-square-foot building, with ceiling heights as high as 45 feet. By contrast, the 34 soundstages on the Warner Bros. lot range in size from 6,000 to 34,000 square feet.

At the Downey facility, where the Spielberg film is referred to as "The Genre Project," the production is akin to classified information, with nobody allowed to go on the record.

People who are trying to avoid any kind of Indy 4 spoilers are safe at TheRaider.net as I won't post any revealing set photos here. Same goes for spoiler-ish text info which will only be visible to readers who choose to be spoiled.

Source: Indiana Jones 4 Blog