OMG we have some amazing easter eggs here!!!

I just finished watching this online. All I can say is that I am super excited. I'll go through some of the concept arts and easter eggs shown so there might be some possible spoilers ahead!

1. Hulk vs. The Hulk Buster
A concept art shown from the early development stages of Avengers: Age of Ultron show Tony Stark rocking the Hulk Buster suit and going all out against the Hulk. The Hulk Buster is so big that it's fist is bigger that Black Widow (a separate concept art). Obviously we know that the Hulk has have a fair few fights with the Avengers so far, but this new line that Marvel is taking, where Tony feels the need to build such a huge suit to handle Hulk, may lead to a possible Planet Hulk storyline or maybe even a World War Hulk storyline. This could be very exciting.
PS. This concept art also answers another question that many fans have asked after watching Iron Man 3 which is 'Will Tony's being cured of his injury mean the end of Iron Man, with the arc reactor being removed from his chest?'. Well, I think this concept art answers that very definitively, no, Tony Stark is still as strong if not stronger even without the arc reactor.

2. Ant-Man teaser
A little 10 second Ant-Man teaser is shown. It features Ant-Man changing sizes as he battles what appears to be a security guard in amazing form. The graphics are very good from such an early stage in development and the choreography for the fight was awesome. This little teaser really is raising my anticipations. However, I highly doubt Michael Douglas will be able to pull off any of those moves so this could lead to the storyline where the Ant-Man mantle is handed down to Scott Lang.

That's a couple things I could gather from this tv special. It's very exciting to see the Marvel Universe develop and I look forward to it very much