I'm honestly a bit pissed as to why it has been delayed from Jan 1st to May, but I do understand the reasoning. They didn't even start filming nor get all the crew until this month, so it would have been a bit unrealistic to release the show in Jan. Even before they changed the release date things weren't off the ground and it would have been pretty far fetched to start filming so close to the deadline.
@RogerWho - I agree with a bit of what you are saying, but the way the actors bring the characters to life is something amazing it itself. They took "iconic" characters that everyone knows, love or hate, and made them Iconic. Now being played so brilliantly by more than one person, these roles are larger than the actors and more like the Greek mythos, something I appreciate greatly.
And I agree with Indy007, this was the best of the new three, and even though it alters Trek mythology, the Trek we all love is still there on Netflix, DVD and BluRay, I'm happy for the new blood and money that made "Discovery" a possibility.
At the same time...I just hope the hype will still be there.
My optimistic guess is that Bryan Fuller knew ahead of time he couldn't work in the winter/spring on this and had to have it completed by then, which is why they were originally targeting January, and when it because painfully obvious they couldn't come close to hitting this deadline, Fuller had to pass and the show got back on a normal schedule. It sounds like he's still in contact and if, god willing, there is a season 2, he would be open to working on that.