It's not about "sides", it's about reality. Shit takes time. People on forums don't want to hear that, but it does. It takes me weeks to get people my translite designs, there's just crap you gotta wait for. If I had to wait for a Karl Urban photoshoot to finish it would take a lot longer!
Stern had two choices:
1) Announce hot new update early, so people would have to wait, but it would build buzz on their new game.
or
2) Wait until it was ready, and then try and get people to care when they've already moved on to guessing what's after Mustang.
1 has the most upside, aside from impatient people on the internet.