In my humble opinion there is no excuse for poor estimates and misleading release dates. By any other manufacturer the release date given means the date the item is available to buy in the shop - as in they have it then in stock.
That is very different from the date they ship the items out of the factory.
Once you announce a product that has a good review/reception on a trade show you normally sit down and work out a realistic release date based on solid facts. Anything else is a guess and in business you can't work on a guess.
...unless the "solid facts" change over time.
Good quality parts availability change over time. Setting up a new high quality production line is a very difficult thing to do, if one wants to keep the final announced price.
The "hype", honestly, was more a public/user thing than Arturia's.
Arturia did what they should, show off the synth to everyone that wanted to see it at the event, send some prototypes for review and basically tell to the world what an awesome little "baby" they had in their product line. The rest was "the internets" and word-of-mouth.
If we can point some "wrong doing" at Arturia was them not adding some extra room for the official release, but like I said, that's also kinda of a commercial gamble and always a tough decision to make. They must've opted to give their best guess with what they knew at the time... which changed, unexpected issues happened (they always do) and only pushing the release date about 2 months, to me, is almost a miracle.
Also, there's the extra delay of the 1st time a new product goes through some customs (they should again, have added this to the announced release date, IMHO).
When they said "it's being manufactured right now, so late April we'll have them in the stores" I thought "hmmm... ok, maybe August then."
I'm going to buy the MiniBrute through Arturia eShop, so, as you can imagine, I'm ready to wait a couple more months until all the production and logistics wheels are running at the right speed.
Better to wait for a good quality product than rushing it to the market with a lot of issues and bugs not easy to solve through a firmware patch (like other digital based products)
Having said that, I can only hope that the MiniBrute is worth the wait, manufacturing quality-wise, because sound-wise, I think I've got enough 2nd hand opinions and reviews from trusted parties.