Its not that they wouldn't show SQ42 (it was a snowballs chance in hell anyways), its that they HAD to. Seriously, they showcased a 3.0 "demo" that was more complex last year than what they have live to test this week.
Its been an entire year of full production (nearing or at over 400 people) and in many cases they have regressed from what they showed last year. Why? Do you guys seriously buy the whole marketing "That was old 3.0 this is new 3.0!".
I said it a few weeks ago, showcasing just 3.0 when they've failed spectacularly to produce it 8+ months past the due date is bad form. Agnostic people will look at it and go "Why are they showing this again? Why should we trust them now?" Zealots will perform Olympic level mental gymnastics to say that everything is normal, not a sign of bad management and YOU DONT KNOW ABOUT GAME DEVELOPMENT
Thought game/experiment: if they are only showcasing 3.0 on their big smoke and mirrors presentation later on, what do they have to show for you to be legitimately impressed? What sort of things will they have to show (or not show) for you to be disappointed? Dont let SC narrative machine make you change your goalposts. Set them in stone now.
For me, they'd have to show and promise to implement even a partial economy when 3.0 hits that lets you work yourself up to better ships. Finally implement something that will be basically the primary threadmill loop of the game. Sense of actual progress in the game that doesn't involve your credit card. Not only will it give you a reason to actually play, but it shows that they are confident enough on their financials that they dont need to heavily depend on milking people through constant sales.
I'd be disappointed with anything else, but would be particularly disappointed if the primary showcase is just showing off things that they've done to hell and back on the ATVs except this time being sold off as nearly complete by presenting them on yet another extremely controlled demo thats not at all indicative of the current state of the development. Basically Gamescom 2016 electric boogaloo. Deduct even more points if they decide to show off an alien threat out of nowhere as coming in 3.0 since it'll just prove that they are following Elites lead on everything. (2015, change to focus on planetary landing after Elite did it. 2017, adding aliens when Elite is doing it)