When will this start production?

interesting,considering that this was filmed in what state and when exactly ?

De Niro can't be in 2 places at once,and studios wont risk that he can't show up and delay the shoot/budget for his sake. See, he was filming his roles for New Years Eve (february 1st till april 8th 2011), Red Lights (february 14th well into late march 2011) and started filming the 50 cent movie on april 18th 2011. All things considered, how could he be in 3 places at once,especially considering he had meaty roles in all 3,and they were filmed in different states(countries).

Would a studio even make a deal like that,where shooting overlaps with other films/studios ? And he would need time to learn his lines for all 3-4 movies too.

I thought this was filmed in late 2010,his role,or after he was done with Red Lights(in feb his parts perhaps), New Years Eve(in march his parts) and in april the 50 cent film.

But this film would need him to be on the lot nearly every day,from march 3rd,so I can't see how he would film 2-3 films simultaneously.

Now,Limitless was filmed march 2010(66),and killer elite in may 2010(66), Ages of Love he did in sept 2010(67) and little fockers in oct-nov 2009(66),before it july-sept 09(65-66) he did Machete and may-june 09(65) ''Stone'' Big Wedding he did in july-aug 2011(67), Silver Linings in october-dec 2011 (68).
Everybodys Fine he filmed in march 2008.(64)

His movie with Travolta in jan-april 2012 (68), Motel in june 2012 (68), Family in aug-oct 2012 (68-69), Last Vegas in oct-nov(dec?) 2012 (69), Grudge Match in jan-march 2013 (69), the new Cooper/Russel movie in march-may 2013.(69)

This guy,ever since he healed from his 2005 tumor and filmed Good Shepherd ,once he healed he did Stardust in 2006 and ever since has been doing more and more,both dramatic and fun stuff.