If you search for [type fruit], you'll get an interesting entry at the top of the results, that says: Fruit — Type: Term
If you search for [type:shakespeare], you'll get: William Shakespeare — Type: Person.
Not every word has an associated type, so that is probably the reason why Google didn't launch this feature oficially.
It would be nice to find out that Google has created a hierarchy of words and expressions similar to Wordnet's synsets and indexes web pages not just for words, but for their meaning. So maybe in the future, we could search for [apple type:fruit] and get only results about fruits, not about Apple Computers.