I noticed this the other day, too. As of last season, about 32% of MLB players are Latin, another 6% African American, and 3% Asian, which adds up to about 42% non-white. The Tigers projected 26-man roster as of this morning is 21 white (81%), three Latin (12%), one Asian, and one African American (remember, Flaherty identifies as black). And one of those Latins is a hip pointer away from being replaced by another (sub-replacement) white guy.
I'm willing to believe that this was a random consequence of front office philosophies in rebuilding the organization and not an explicit ethnic cleansing of the roster. That said, the paucity of obviously African Americans on the team can't be helping with rebuilding fandom among black Detroiters.