Hey Aderli,
the blog posts are still blog posts and the grid still consists of portfolio projects in version 3.0 – in fact, so far I am not planning to add this hack to the theme because, as pointer earlier, the grid has been envisaged to display portfolio items, and the blog has been made to look different on purpose, in order for the users not to confuse the two. You can try implementing the custom solution posted here, preferably via a child theme, yet the extra code is not present in the 3.0 theme version.
By the way, I am building a new theme right now, called Shogun, which will offer much more page templates that any other of my themes, and there the user will be able to choose a grid layout independently for a blog and for a portfolio. Stay tuned!
Sincerely,
Andrii / Satori Studio