No wikipedia results on Spotlight search

Yosemite issue here:

In all the demos made for the Yosemite presentation of the its new features it's shown the ability of getting wikipedia results via the spotlight search.

In my case i just get a lot of results relatives to my local files but no links to wikipedia or any webpages at all.

I have tried selecting all options in SYSTEM PREFERENCES>SPOTLIGHT with no success.

Thanks,