^^ In moments like this I don't like Omona, because they have tendency to post veeeeeeery old news. Like this whole BoA post from today.
...But it's my fault because I didn't post it earlier. T^T Probably you'd see this earlier than people on Omona.
I don't think she changed her hair color. Looks like recent one, which we saw in WW PV, Samsung conference etc.