Here's my view of these hints and the games. I think each hint is just a specific part of the game or something like that (maybe the robot). I think that the Rick Astley hint is pointing to the end game, since the screenshot was taken at exactly 3 minutes, and if that's the length of the new game, it would be the end game. 3 is coming up a lot, so this must be extremely important. I think the pins have something to do with the layout of the field.
Someone looked into that picture's metadata and found the gps coordinates of where it was taken from. It was taken at SEE Science CenterI did some more looking into SEE Science Center. Relevant to the threes that are coming up a lot this year, there's a "Mill Number 3" right below it on Google Maps. Also, they just finished up the "Lego Millyard Project" featuring a model with over 3 million Lego bricks and, get this, it was sponsored by FIRST. Lego also turned 80 this year
http://www.see-sciencecenter.org/vis...d-project.aspx
Keeping things relevant to how this clue may be entirely about the end game, two years ago, minibots were introduced for the game. The line "never gonna give you up, never gonna let you down" may be saying that it's them bringing back old game elements. The minibots were introduced as an integration of the other FIRST Leages, and some teams got FTC teams to build them a minibot. Maybe we've got more integration, but with FLL. FLL is also the third FIRST league. If the end game has to do with that, then 3 would definitely be very important, seeing as how the end game tends to be a game changer.
As to what they'll be doing, rolling comes up a lot here. That last hint was part of pi, and pi has a very close relation to circles. If you hit play at the 3 minute mark of the Rick Astley video, the next thing he says is "Never gonna let you down". Maybe you have to roll something up a steep hill (or something like that)? I'd like to hear more ideas on this.
As for that interesting find in the KOP about the size change of the robot, I think we may be seeing smaller robots, and a bigger alliance. FIRST is getting a ton of new teams from that agreement they made with YMCA last year. This many teams in FIRST would make the current setup of 3v3 matches taken even longer, and there may not be time in the schedule for that. Many others have also pointed out in this thread how last years field had an interesting driver station setup, that could have been FIRST testing out some of the changes. A smaller chassis would also put rookie teams at less of a disadvantage to teams who pre-designed chassis (and shared them publicly) and already know what their doing. They'd have to redesign, just like everyone else. To me, a 4v4 change-up just makes sense for this year.
Looking over all of this, i've just noticed something rather interesting, although it may have nothing to do with the game itself. We've got the
3 sided triangles/tetras (relevant to all the threes), rolling objects (such as spheres), and rectangular Lego bricks (FLL/maybe FTC). That's triangle, circle, square. It's the first logo. Maybe each portion of the game models part of the logo? That may be pretty far off, though.
I'm not entirely sure what the decoded version of the "3rd" hint means, but it probably ties into this somehow. Also, the pin layout on the Rick Astley picture probably means something, but i'm not sure what. It'll all make sense after we see the game.