I'm glad I'm not the only one who got the impression that both Terry (again, until the epilogue) and Matt looked to be at least mixed-ethnic Asian decent in the cartoon series. Heck, even the artstyle of some of the Batman Beyond comics, including the main artist of the current one, occasionally gives off these vibes of mixed-ethnicity for the McGinnis brothers.
While I do look forward to what a Batman Beyond animated movie in this day and age will bring (I'm hoping Matt plays a bigger role here than he did overall in the cartoon), count me in with those who wish they had picked someone from the Bat-verse who is historically of a confirmed minority ethnicity. A Duke/The Signal movie would have been cool, even if it'd need some form of tweaking that might risk hurting Duke's origin and early growth that makes the character who he is (his Endgame and We Are Robin days).