I'm asking if it's possible to define theme options in somewhere/somehow. What I mean, for example I'll like to add options like show slider on homepage, show topbar, define a custom message for topbar an use in the theme and so on, is that possible? If so, how?

Theme customization is a planned feature.

Good to hear about, any soon release of this feature?

Couldn't this be done with Config::get and the php section of layout/pages