Relax, seriously.
Halo 4 will not be released until the Holidays. That will be many months from now. Game developers can get so much done in that little time. Look at what Bethesda did with Skyrim in only a week for Game Jam.
Just because they had a clip showing sprint doesn’t mean that any of the other armor abilities will be included. Sprint could be scrapped at any time or if they do include it, there’s no telling how each playlist will defer from each other and there’s no telling what other changes they’ll do before the game is released.
From all the footage I’ve seen, the game’s physics relatively resemble Halo 2 and Halo 3 more than Halo Reach. Matt from HaloTracker got to play Halo 4 at Spring Showcase and he commented that the BR felt more like Halo 2.
343industries is composed of 3 or more former core Bungie employees as well as former members of companies such as Ubisoft, EA, Bethesda Softworks, id Software, FASA Studios, Kojima Productions, Pandemic, Black Isle Studios, Gearbox Software, Treyarch, Guerilla Games, Sony, Edge of Reality, Midway Games, Timegate Studios, Tryptych Studios, Turn 10 Studios, Hidden Path Entertainment, Raven Software, Liquid Dragon Studios, Activision, Namco, Kuju Entertainment, and more. Source.
All of these people left their companies to work on Halo because they are fans of the game themselves. With the guidance of former core Bungie employees, this company has the greatest potential to carry out and revive what we all love and enjoy about Halo. This team has an accumulation of over 200 years of experience with video games.
Very little actual gameplay has been shown so far so judging how multiplayer will be on such little information is ridiculous.
