What was your first reaction when you saw the Return to Monkey Island teaser?
for me: After a long day, I opened Instagram to take a break, and the first thing I saw was a new post from the LucasFilm page, and I quickly realized it was about Monkey Island! I was so excited that I forgot we were in April, after a few minutes I thought it might be an “April Fool” but it wasn’t.
I was extremely surprised, because I knew that it would have been very difficult for Ron to get a chance to make a new Monkey Island game. So I smiled, when I saw Murray addressing exactly that point. 
Overall, I was excited, because a new Monkey Island game by Ron Gilbert is quite a deal for me. That’s why I came back to this forum after a long hiatus: here I can find people who loved the MI games as I did.
Still, probably my age has made me a bit cynical, because I didn’t start jumping all over the room screaming “OMG OMG!”, as a previous me would have done. 
I would say that I was cautiously exited. 
I understand exactly how you felt at that moment 