Well, from my perspective, being located in the Belgian market : I registered my interest with Alfa Romeo via their website : never received any news until today. I talked to my dealer about buying one : never had any news. A few months later the same (!) dealer via an Alfa forum, the day itself, gave the hint that there was a 4C in his Belgian showroom. I knew nothing and saw the post too late.
Since then via a detour I ended up talking to another dealer and ordered one. We still regularly talk but no news about an official launch.
So I would say (1) Alfa is keeping it all "mysterious" on purpose by keeping it sporadic and slightly chaotic (I believe that is called "playing their strenghts") and (2) not an official launch I would think. Or if it is, a "secret" one.
I remember Fiat Belgium launching the 500 "peoples car"... at an "exclusive event" :-D
Priceless. At least now it is appropriate.
I would like to see a sample of my recent purchase in the flesh though. If you can please let me know where this 4C will appear.