This is shaping up to be one of the biggest TGS' yet as all three are now making a huge emphasis on their lagging Asian markets with the current gen.
Sony's pre-TGS show introduced 44 "new" titles and promises more at the show. Microsoft will being doing 24/7 live cast coverage during the event and has a number of exclusives (mostly visual novels) to showcase. Finally Nintendo will be focusing on their New 3DS along with some highly anticipated titles set to release in 2015.