The following is intended as a comprehensive list of links and information about the next major release of Dungeons & Dragons, currently named D&D Next.

The initial announcement:

• Wizards Announcement
• Mainstream media tie-in articles:
  • New York Times article
  • Forbes article and follow-up with links to some gamer reactions
  • CNN Geek Out Blog article
• EN World tie-in articles:
  • Wizards of the Coast Seeks Unity
  • Off to See the Wizards
  • A summary of 5e related information
• Follow-up articles with the designers:
  • Lead Developer Mike Mearls Answers Questions About "Dungeons and Dragons Next" at MTV Geek
• Info from seminars and playtests at DDXP
  • Images from @gregbilsland: Photo 1, Photo 2
  • A report from E at Geek's Dream Girl.
  • What We Learnt From the First D&D Next Seminar at The Trollish Delver.
  • Summarized Transcript of Class Design Seminar compiled by Morrus at ENWorld, based on several people live tweeting the seminar.
  • My Fellow Gamers, Stay Classy from Dread Gazebo.
  • Class Design Seminar Video recorded by Dread Gazebo of Obsidian Portal.
  • My First Look at D&D Next
  • The 2012 D&D Experience: Post-Convention Thoughts
  • Even WotC got on the bandwagon with D&D Playtest News for Week of January 30
  • New Info On Classes In D&D Next from Trollish Delver.
  • Brave New World #72: D&D Next: I Played D&D 5th Edition
  • Considering the D&D Next Playtest in Light of the WotC Seminars at D&D: The Fifth Column.
• RPG blog responses:
  • Crtical Hits' article
  • Bruce Cordell announces he'll be working on 5e
  • Jeff Grubb thinks new editions are a feature, not a bug
  • Rob Schwalb talks about D&D Next
  • Escapist discusses the public playtest
  • The Dread Gazebo's full response to CNN
  • Sarah Darkmagic mentions she was in an early playtest of 5e
  • DeadOrcs Weighs In On DnDNext
  • The Illuminerdy's commentary on the new D&D
  • 4eblogs is now dndblogs.com
  • Save Versus Death looks towards the future of D&D
  • Neuroglyph's Quest for Grand Unified D&D
  • Grey Wulf opines on the news
  • An "open letter" to WotC from a 3rd party developer
  • A farcical open letter from Troll in the Corner
  • NewbieDM's reaction to the announcement
  • NewbieDM asks for old PDFs and conversion documents to use them in 5e.
  • The Cool Ship is excited about the next edition, but thinks D&D is too big to fail.
  • Jeff Rients wants Wizards to release PDFs of the previous editions before the next edition comes out.
  • Gaming Tonic's post-playtest list of wants and don't wants for 5th edition
  • The 5e Cometh at MyRPGame.com
  • Dungeon's Master's thoughts on 5e
  • The Action Point's 5e wishlist
  • A Walk in the Dark - Pleading the Fifth
  • Grognardia - Rebound
  • Adam Page's thoughts on the news
  • Trollish Delver - What you need to know about D&D '5th edition' {D&D}
  • Syntax Error works through some theorems and axioms about D&D design
  • Greg Christopher: My Advice for Wizards of the Coast is a blogged version of this Google+ thread.
  • DeadOrcs weighs in on DnDNext with a retrospective on previous editions.
  • D&DNext Wish List from Robin Laws
  • D&D 5e and Build-A-Game Hurdle by bankuei at Deep In The Game.
  • Hamblin's 5e Living Campaign Wishlist at Roving Band of Misfits.
  • A New Front in the Edition War from Steve Winter on his blog Howling Tower. Also see the followup which expands on that: A New Front, Part 2
  • A Plea to D&D 5th Edition Playtesters from David Flor at A Walk in the Dark.
  • What Is the Next Dungeons & Dragons at Game Informer.
  • Why You Should Care About The Next Edition of D&D at MTV Geek.
  • Singing the Blues for 4th Edition at Living Dice.
  • The Next D&D Living Campaign, A Newbie's Perspective by Sarah Darkmagic at Roving Band of Misfits.
  • The In Thing To Do by Jeff Greiner at RPG Musings.
  • The Latest Reports From the Front: Responses to D&D Next.
  • My D&D at Squaremans, a what I like about D&D list of attributes.
  • Our Toughts on D&D 5th Edition.
  • D&D Next Cautious Optimism 6: In Summary at Student 20 Productions.
  • Tenkar's Tavern looks at Vancian magic in Picking Nits From Monte's Latest - Putting the Vance in Advanced.
• Podcasts:
  • The Tome Show discusses D&D Next
  • Dice Monkey Radio's D&D Next episode
• Social media threads and responses:
  • Monte Cook offers brief thoughts about the announcement
  • A 5e announcement thread on reddit.com
  • Thinking about changes to the 5e business model (Google+)
  • DNAPhil's open letter to the 5e design team (Google+)
  • MetaFilter's FPP on the blue for the announcement.
  • Jared von Hindman's research into Rich Burlew's setting possibly being used for 5e. (Spoiler: It's not.)
  • It's All D&D at Classic RPG Realms.
  • How Is 5e D&D Gonna Pull This Off? at Classic RPG Realms.
• Webcomics:
  • d20 Monkey
  • Penny Arcade
    • Penny Arcade's relevant news post
• Miscellaneous:
  • D&D 5th Edition: What We Know About "D&D Next" at EN World, which they plan to keep updated as a running description of the information released so far.
  • HUGE DDXP 2012 Updates at Baldman Games

And:

• Leaked playtests:
  • Giant in the Playground post

If you want to be part of the playtest, sign up at Wizards.com D&D Next Community