The Realm of Never Cast of the Shadow - 2007 was released on:
USA: 10 October 2007 (video premiere)
Mortal Kombat Defenders of the Realm - 1995 Old Friends Never Die 1-5 was released on: USA: 19 October 1996
Souls in the Shadow - 1912 was released on: USA: 11 May 1912
Electric Shadow - 1998 was released on: USA: 4 June 1998
Lonelygirl15 - 2006 Shadow of Death was released on: USA: 8 September 2007
Without a Shadow - 2012 was released on: USA: 2 May 2012 (CSUN Senior Showcase)
No. Any release dates you see are fake, and Sega will never make a sequel.
Mortal Kombat Defenders of the Realm - 1995 Old Friends Never Die 1-5 was released on: USA: 19 October 1996
The Realm of Sport - 1924 was released on: USA: 19 April 1924
The Silent Realm - 2010 was released on: USA: 1 January 2010 (Columbus, Ohio)
In the Shadow of the Moon - 2014 was released on: USA: 2014
From the Shadow - 1915 was released on: USA: 4 January 1915
The Shadow People - 2011 was released on: USA: 2011
In the Shadow - 1913 was released on: USA: 28 October 1913
In the Shadow - 1915 was released on: USA: 4 January 1915
Out from the Shadow - 1911 was released on: USA: 3 August 1911
The Shadow - 1913 was released on: USA: 8 June 1913
The Shadow - 1914 was released on: USA: 23 February 1914