It looks as though it's been officially confirmed AND, they are adding new actors to the mix.  Kevin Kline will also join the team! 

Just a little over an hour ago about the new Charlie Kaufman project Frank or Francis. While the story revealed the subject of the movie - online film critics - one key piece of information the story lacked was who will actually be starring in the movie. As I mentioned, Nicolas Cage, Jack Black and Steve Carell have had their names connected to the project, but it was unknown if they would actually be doing it. It turns out that they will be and another actor has joined them as well.

Variety reports that the three aforementioned actors are now all officially attached to star in Frank or Francis as is Kevin Kline, who will be playing two roles. The story revolves around Black's character, Francis -an "extremely intelligent Internet troll" - who takes pleasure in taking direct aim at a "successful, somewhat pretentious filmmaker" named Frank, played by Carell (who also happens to be cheating on his wife). Cage, who returns to Kaufman's work for the first time since 2002's Adaptation, plays a high profile actor named The Emcee who is known for making high concept films.

But here is where it gets weird: one of the characters that Kline plays is named Richard Waller, brother of Jonathan Waller, the filmmaker responsible for the most successful movie of all time. But while you may be thinking that Kline will play his own brother, you're dead wrong. Instead, the second role Kline will play a character called Richard's Head, "an animatronic head that, through the use of advanced screenwriting techniques, helps Jonathan develop a completely inoffensive product that will have the broadest possible appeal and zero artistic integrity." I'll wait while you let that soak in.

The casting process isn't over yet, as they are still looking for two actresses for singing parts (yes, there's apparently singing involved). Kaufman will be directing the film himself (only his second effort after 2008's Synecdoche, New York) and the project is scheduled to start production in January.

The Playlist article says this about the Emcee:

'There’s then actually one more “lead” character,  Alan Modell (also known as the Emcee in the script due to his Oscar hosting duties), a comedian with a faltering career who is known for his wildly popular, immensely moronic “Fat Dad” roles (not dissimilar to “The Fatties” from “Tropic Thunder”).'

It gets more and more intiguing.

Rope Of Silicon have published a pretty indepth look at the script for Frank Or franci.! It claims not to be spoiler heavy but it will inevitaly give more insight into the film, so the usual warning applies..do not read if you are spoiler shy!

http://www.ropeofsilicon.com/article/charlie-kaufmans-script-frank-francis-downright-amazing-possibly-made

Gina wrote:

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Lula Argante wrote:

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Rope Of Silicon have published a pretty indepth look at the script for Frank Or francis. It claims not to be spoiler heavy but it will inevitaly give more insight into the film, so the usual warning applies..do not read if you are spoiler shy!

http://www.ropeofsilicon.com/article/charlie-kaufmans-script-frank-francis-downright-amazing-possibly-made

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Good stuff Lula!  It's interesting how Kaufman may be mirroring Nic's character after comedian Eddie Murphy!

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 You are welcome Gina! Yes, i agree, I am glad that Nic is playing this character, I think it gives scope for all kinds of shenanigans!