Layout of last year's presentation:
00:56 Pokémon X and Pokémon Y
04:13 Super Mario 3D World
07:43 Mario Kart 8
10:56 Wii Party U
14:52 2013 3rd Party Releases
17:40 2013 Wii U Nintendo eShop Releases
19:25 The Legend of Zelda: The Wind Waker HD
23:59 The Wonderful 101
25:58 Donkey Kong Country: Tropical Freeze
28:54 Bayonetta 2
31:50 Monolith Soft
34:23 Super Smash Bros.
38:33 Nintendo E3 Booth Tour
Most of the individual games didn't exceed three minutes each.
Add in: I suppose they could go either way with it. They could cram in more content within the extra 20 minutes or they could spend more time on each new game shown. If the Twitch stream is any indication, four new big games will be announced along with more content for Hyrule Warriors, X, Bayonetta 2, and, of course, Smash Bros.