In the final minute of the (awesome) episode, Hiro say's the following: "We must warn Angela Petrelli! And Nathan! And Flint's sister, Meredith she may be able to..."
So I was wondering what does he mean when talking about meredith? does she have an important role to play im not seeing?

My understanding was maybe Meredith could move Flint to the other side. Cause i'm pretty sure Flint still cares about her and hopes that Meredith is safe. Or maybe he's thinking his sister is dead and it's all the company's fault and that's why he's a villain.

Im not too sure about his feelings towards his sister. After all, he did jump out that train and leave her.

well i think he knew she could charr that dudes(forgot his name) azz

i think he'd be happy to see her and she could convince him to help her.

Didn't she tell him to run though? When someone you really care about tells you to do something, most of the time you do it. Also he did know she could take on Thompson.