From Stars & Stripes, 9/11 trial to start Monday in New York (by Richard A. Serrano, Tribune Washington Bureau, March 2, 2014):

WASHINGTON — Weeks after he took office, President Barack Obama met privately with 40 grieving Americans, many clutching photographs of loved ones lost in terrorist attacks.

The new president told them he would be closing Guantanamo Bay military prison within the year and putting many of the detainees there on trial in the U.S., where justice would be swifter.

Five years later, the first and probably only federal court trial of a Sept. 11-related case will start jury selection on Monday at a U.S. District courthouse in lower Manhattan, not far from where the World Trade Center once stood.
Obama’s plans to relocate other Guantanamo detainees, most notably self-confessed Sept. 11 mastermind Khalid Shaikh Mohammed and four others accused in the plot, ran into congressional roadblocks that prevented the president from trying them in New York and closing the Cuba detention facility as he promised.

But when Sulaiman abu Ghaith, 48, Osama bin Laden’s son-in-law, who is accused of being a top al-Qaida propagandist, was arrested last year, the Justice Department brushed aside pressure to send him to Guantanamo and launched proceedings in New York, partly as a test case to demonstrate that high-profile terrorism trials could be handled safely and efficiently in the U.S.
Federal prosecutors in New York are hoping to prove that justice can move faster there. They are seeking life in prison with no parole for Abu Ghaith, who is accused of being a Qaida leader and calling for additional attacks after Sept. 11. Prosecutors did not seek the death penalty because Abu Ghaith is not accused of directly planning or carrying out acts of terrorism. ...
This one has been something of a sleeper case. Here's some background:

Sulaiman Abu Ghaith Wiki.

Initial NYT story from Mar 2013, Bin Laden Relative With Qaeda Past to Have New York Trial (by MARK MAZZETTI and WILLIAM K. RASHBAUM, March 7, 2013).

SDNY Indictment.