spotlight search does not include map, iTunes, google...

I upgraded to yosemite from mavericks after seeing the latest feature videos from WWDC

But greatly disappointed to see so many features showcased does not work the same way as it was showcased

For example

The spotlight is not working as expected, it does not include maps, web search, photos etc., i even changed the default search engine to bing still does not work

Any idea, if i am missing something

Also is it possible to include github, stack overflow, wikipedia in the spot light search

~Basavaraj