Persuasion:
Source: http://www.rockpapershotgun.com/2011/04/18/skyrim-skills/#more-57393
Info: "The speech skill: “There is not a Persuasion wheel. It’s much more simplified. There’s not a mini-game for it.” He declined to describe it until later, however."
Lockpicking:
Source: http://www.rockpapershotgun.com/2011/04/18/skyrim-skills/#more-57393
Info: "Lockpicking: “There is a minigame, but I hate the word ‘minigame’. There’s also a combat ‘minigame!’” [That latter is irony, don't explode.] “You’ve got to have some interaction, not just a die roll.”"
Horses:
Source: http://www.gamepro.com/article/previews/218905/skyrim-preview-cont/
Info: "Horses help you get around in Oblivion, and since that game’s 2006 debut, a number of games have made horses part of the game (some better than others). “We’d really like to have horses, Howard says. “We want to make sure it’s adding to the gameplay. Horses have come a long way in video games. It’s looking good right now.” To which Peter Hines, Bethesda’s vice president of marketing, cracks, “If no horse, how would we sell you horse armor?” Howard had a quip of his own ready: “We’d still sell it to you—just no horse for it.”"
Dragon mounts:
Source: http://www.gamepro.com/article/previews/218905/skyrim-preview-cont/
Info: "And what about dragons? Can you use them as mounts? “Are we considering it? Yes,” Howard says. “Are we doing it right now? No.”"
Birthsigns:
Source: http://multiplayerblog.mtv.com/2011/04/18/skyrim-character-creation-guide/
Info: "Other decisions, like Birth Sign, have been removed, so players needn't worry about making a game-ruining decision within the first hour."
Battle music:
Source: http://www.gamesradar.com/xbox360/the-elder-scrolls-v-skyrim/preview/skyrim-preview-abandon-all-hope-ye-who-expect-to-have-a-life-once-this-dragon-born-epic-arrives/a-20110417182154399032/g-20100727104555695026/p-2
Info: "Naturally, he sees us and dives immediately in our direction. As the music rises in volume and urgency, the dragon roars out a word in the dragon tongue and belches a massive gout of flame directly at us."
Source 2: http://www.g4tv.com/videos/52434/Elder-Scrolls-5-Skyrim-Gameplay-Preview/
Info 2: "Suddenly, strong, deep violin notes pull us from our sightseeing, and focus our attention further up the path where a foolish raider has decided he’s lived a rich and full life, and is now charging at us with his sword unsheathed."
Seasons:
Source: http://www.videogamer.com/pc/the_elder_scrolls_v_skyrim/preview-2974-2.html
Info: "Seasons don't change in the game, however."