Not only does George Lucas want a fifth Indiana Jones, but he's already talking about handling the franchise the way he handled Star Wars, and that's not good. He wants to modernise it.

Talking about Indiana Jones and the Kingdom of the Crystal Skull (Filmstalker review) he reveals that there was a lot of tension between him and Steven Spielberg and that it is a hybrid of their ideas.

From the comments it's clear that the working relationship between George Lucas and Steven Spielberg wasn't that great, and in fact it sounds as though Lucas is pointing the finger a little towards the others involved in the film, saying that doing the first three films was easy because it was just him making the decisions.

Have a read of the comments from The Sunday Times through Coming Soon and see how Lucas may have just killed his chances of working with Spielberg on the next Indiana Jones film:

"...it was a challenge getting the story together and getting everybody to agree on it. Indiana Jones only becomes complicated when you have another two people saying ‘I want it this way’ and ‘I want it that way’, whereas, when I first did Jones, I just said, ‘We’ll do it this way’ — and that was much easier. But now I have to accommodate everybody, because they are all big, successful guys, too, so it’s a little hard on a practical level...

...with the last one, Steven wasn’t that enthusiastic. I was trying to persuade him. But now Steve is more amenable to doing another one. Yet we still have the issues about the direction we’d like to take. I’m in the future; Steven’s in the past. He’s trying to drag it back to the way they were, I’m trying to push it to a whole different place. So, still we have a sort of tension. This recent one came out of that. It’s kind of a hybrid of our own two ideas, so we’ll see where we are able to take the next one."

Get that? I'm sure Spielberg did, it almost sounds like he was just in the way there, and he still is. Imagine the audacity of wanting to go back to the old Indiana Jones!

However this does point to something. All the good parts of Indiana Jones and the Kingdom of the Crystal Skull (Filmstalker review) probably came from Steven Spielberg. The rest, like the nuclear survival fridge, the gophers, the monkey swinging vines and young Indy, all probably came from Lucas, the man who brought us the three new Star Wars, a half hearted Darth Vader, and Jar Jar Binks.

Still, if he comes up with the idea and they either all agree, or they just bend to Lucas' desires, it sounds like we could see a fifth film:

"We were hoping for box-office figures like that, which is, ultimately, with inflation, what the others have done, within 10%...So, we squeaked up there."

However I think one thing is clear from these comments, Lucas wants the young Indy to take over, and Spielberg wants to stay with the old Indy.

Personally I'm with Spielberg on that one.