Look what I found in one the
Jaan Kanellis blog,
"...I think the biggest change of the suggestion feature will be losing long tail keywords. Where you would usually see 4-5 keyword phrases, searchers may opt to try the short tail version Google Suggests. Even is the user stays with a long tail query it more than likely will be one from Google Suggests and not and original one from the end searcher. I remember Google saying at least 25% of all searches never occurred before. We can expect this number to come way down now from this change. So why is Google doing this? Maybe they are trying to push AdWords inventory more? Obviously the shorter the tail the more chance someone is bidding for the keywords."