Doesn't yakuza usually sell like 500-600k?
So the prediction then is the PS4 version would sell 150k.
Yakuza sales through the ages:
PS3 : Yakuza 5: Yume, Kanaeshi Mono ( SEGA ) { 2012-12-06 } - 363,717 / 583,487
PS2 : Yakuza 2 ( SEGA ) { 2006-12-07 } - 281,836 / 572,917
PS3 : Yakuza 4 ( SEGA ) { 2010-03-18 } - 395,123 / 557,771
PS3 : Yakuza 3 ( SEGA ) { 2009-02-26 } - 356,867 / 509,306
PS3 : Yakuza: Dead Souls ( SEGA ) { 2011-06-09 } - 307,592 / 417,504
PSP : Kurohyou 2 Yakuza: Ashura-hen ( SEGA ) { 2012-03-22 } - 94,833 / 175,666
PS3 : Yakuza 1 & 2 HD Edition ( SEGA ) { 2012-11-01 } - 42,397 / 76,146
PSP : Kurohyou Yakuza Shinshou [PSP the Best] ( SEGA ) { 2011-12-01 } - 2,500 / 62,546
PS3 : Yakuza 4 [PlayStation 3 the Best 2nd Print] ( SEGA ) { 2011-12-01 } - 600 / 29,267
PS3 : Yakuza: Kenzan! [PlayStation 3 the Best 2nd Print] ( SEGA ) { 2011-12-01 } - 600 / 12,833
PS3 : Yakuza 3 [PlayStation 3 the Best 2nd Print] ( SEGA ) { 2011-12-01 } - - / 12,272
PSP : Kurohyou Yakuza Shinshou ( SEGA ) { 2010-09-22 } - 183,339 / 274,539
PS3 : Yakuza: Kenzan! ( SEGA ) { 2008-03-06 } - 177,897 / 270,438
PS3 : Yakuza 3 [PlayStation 3 the Best] ( SEGA ) { 2009-12-03 } - - / 103,423
PS3 : Yakuza: Kenzan! [PlayStation 3 the Best] ( SEGA ) { 2008-12-11 } - - / 101,567
PS3 : Yakuza 4 [PlayStation 3 the Best] ( SEGA ) { 2011-01-20 } - - / 57,015
PS2 : Yakuza ( SEGA ) { 2005-12-08 } - 129,863 / 345,323
PS2 : Yakuza [Playstation 2 the Best] ( SEGA ) { 2006-10-26 } - 33,012 / 484,199
PS2 : Yakuza 2 [Playstation 2 the Best] ( SEGA ) { 2007-12-06 } - 17,659 / 255,061
PS2 : Yakuza [Playstation 2 the Best 2nd Print] ( SEGA ) { 2007-12-06 } - 1,800 / 53,657
Kenzan is the best comparison for Ishin.