I am wondering how Google Instant is determining the keywords users want to search for? is Google tweaking keywords it suggests in Instant on its own, is it trying to change user search behaviour by making them type for longer queries which Google thinks is more relevant? I remember i used to search for a different set of queries for mobile phone searches, i used to target them and now all of sudden the queries have gone longer with extra strings and different set of sites rank for those, making older queries obsolete, i can also spot increase in traffic for those new sites and dip in traffic for old sites. People are now searching for what google instant suggests.