I've able to sort out the issue but I think not in the most ideal way.
According to Microsoft, you should download additional languages pack through the language preferences view.
That's ok and quite easy, just add the additional language and download it. The problem comes, as happened in my case, when you add the language pack and doesn't appear the download option for that language, the new language is just available as an Input method
If you go to the Microsoft site for language pack downloads (Language packs) and have a look at the Download method next to each language, you'll notice that many of the just can be download from the Control Panel, And the rest are available for direct download. On of them is the English language pack.
Looking on the Internet, I got the links for the English language pack and a few more from this site All Windows 8 Language Packs. The site is in Spanish, but it's not quite complicated find out the right link for your language pack. Download the file and follow the steps below the links.
After the LP installation, I see the Windows display language option and can use English US as the display language for my Windows 8 Pro.
Thank you.