Mira's influence on S2's story
If Mira is going to appear in S2 alongside Morgryn, I think it's safe to guess she won't speak much (if she speaks at all). Telltale slid in that "Morgryn will now speak for you" caption for a reason.
But it'd be cool if her presence still alters the story in some way, even if most of those alterations are restricted to dialogue. Morgryn will probably keep his eyes locked on Ironrath, with or without Mira's help. But maybe the fact he's married to Mira would make his schemes more "legit." This would hardly make Morgryn's schemes any less devious; look at how many Wall Street businessmen have gotten away with murder, while keeping it all perfectly legal. Mira's marriage would simply allow Morgryn's claim on Ironrath to be within his sanctioned right as a lord, which would put the rest of the Forrester clan at a serious disadvantage.