Filters attributes on listing meta title

[Coluccini]

Hi!

I'm updating an store from 1.6 to 1.7, but there's something important I'm not being able to achieve: on 1.6 I have handled to add attributes selected from filters to be showed on the page meta title and title (Like "Shirts" -> "Shirts Blue" -> "Shirts Blue Large"), but on 1.7 I'm not able to do it. 

I've found that meta title is set in getCategoryMetas() method from Meta.php, but I can find a way to access to the selected filters.

Can anybody help at least to know in which file to look at?

Thanks!