The Tom Clancy's CIA superspook was first portrayed by Alec Badwin in 1990's The Hunt For Red October, then two outing by Harrison Ford in Patriot Games and Clear and Present Danger before turning into this dedase with Ben Affleck's rebooted The Sum of All Fears.
Producer Mace Neufield in a recent press conference for Clint Eastwood's Invictus said "We ran out of books. Red Rabbit was the last one, and we just couldn't seem to get a script out of it." Red Rabbit is one of the two only novels alongside The Cardinal of the Kremlin in wich Ryan is young enough to be portrayed by Chris Pine.
Hasan Amini and Adam Koxac are working on the screenplay, which has been described as "Ryan picking up his day on Wall Street". In the novels by Tom Clancy, Jack Ryan works with a Wall Street firm called Merrill Lynch after serving as Marine Corps but before been recruited to CIA. Since it's Ryan was as a CIA-analyst in The Sum of All Fears and it was a prequel to the previous three films, it will be easy to say that this is another reboot or prequel to a prequel?