DIrishB
The Timeline Guy
The canon was just getting easy to sort through as to what was and was not official, but I've seen a couple of things brought up over the last month or so where some official word on the canon like we were getting before with the comics would really come in handy. Someone in the past seemed to have some good luck tweeting with some of Marvel's people, and they responded item by item stating whether a certain comic was canon or not.
In particular, these two comics:
Agents of S.H.I.E.L.D. #1 - The Chase
This comic never had any Marvel Cinematic Universe Official Tie-In red stamp, however reading this from the official Marvel site has always left me questioning why the comic did not have the stamp: "Together Lexus, Marvel and the team behind 'Marvel's Agents S.H.I.E.L.D.' collaborated to create a backstory to the TV series that has utter continuity with the show...". "Utter continuity."
Jessica Jones #1
From writer Bendis's blog: the comic "is in the marvel tv universe and it celebrates the new show and the connective tissue that will build between the series." The comic has the Marvel logo, the Netflix logo, the Daredevil and Jessica Jones logos....everything to make it look like it's meant to be part of the MCU canon. But it's missing the key red stamp that discerns canon from "inspired by".
As far as I know, the AoS The Chase and Jessica Jones comic are both MCU canon.
While they don't feature the MCU red stamp like the film preludes, it's important to point out that neither did the Infinity comics (Age of Ultron - This Sceptre'd Isle, Ant-Man - Scott Lang: Small Time), and yet those two Infinity comics are absolutely MCU canon.
It could be argued that really it's only the Prelude and Adaptations that feature the MCU red stamp, the ones released in comic form. The digital Infinity comics (the AoU-TSI, A-M-SL:ST) and TV-based comic expansions (AoS-The Chase, Jessica Jones) seem not to have that rule applied, but almost certainly are still MCU canon.
When the WHiH videos started coming out, more questions were raised as far as if these videos are considered canon, and if previous short videos set in the MCU were canon as well. The following is a list of everything I could find (mostly from a list compiled by /u/bflaminio on the /r/marvelstudios subreddit):
Stark Expo 74
Stark Expo 2010
Stark Expo 2010: AccuTech
Stark Expo 2010: Cordco
Stark Expo 2010: Fujikawa
Galaxy Getaways
Meet Darren Cross
WHiH Newsfront Promo
WHiH Newsfront Top Stories
WHiH EXCLUSIVE: 2012 VistaCorp break-in security footage involving cyber-criminal Scott Lang
WIRED Insider Interviews Darren Cross, CEO of Pym Technologies
WHiH EXCLUSIVE: Scott Lang Interview
I can see different sides to whether people think these are canon, or fit as canon, or work in some kind of head canon. What I'm really looking and hoping for in this post is to: a) gather in one place the comics and videos that I have seen most discussed as far as their canon goes; and b) look for anyone who works for Marvel or anyone who knows who to talk to at Marvel to clarify officially their canonicity. I think wyokid was talking with Will Corona Pilgrim about MCU canon back in 2012, and I believe Aztlan was also getting some responses as recently as 2014. In February of 2015 in a Comic Book Resources article, we once again saw Will Corona Pilgrim talk about "in canon" versus "inspired by".
I see those videos as canon. I honestly didn't know the various Iron Man 2-related ones existed, and forgot to add the GotG one. I'll get those added.