The news about him working on other games is interesting, especially in light of the recent attacks on him. The attacks were because of a lack of updates and so on, and if the guy is already thinking about moving on to other products, I can see concerns about him not supporting this product, for all the reasons he was being defended in response to those attacks (being only one guy, etc...). I'm wondering if those hackers knew things ahead of this annoucement (which isn't all that recent by now, I could have the timing wrong).
I'll also be honest in saying that the concerns about him leaving this game to rot, despite the innovation, and going on to something that interests him more are not totally unfounded. Independant and freelance developers are infamous for that kind of thing. If you think about it there have been tons of unfinished, but very popular works throughout the years that died for exactly that reason. If Notch is already rich to boot, one can also become concerned that he has little motivation compared to before he made his money.
No reason to be concerned yet, but I think everyone is dreading him putting something else out and saying "well I don't plan to abandon Minecraft, so don't worry, but I'm really interested in this right now..." or perhaps not even actually making another product and saying "I need a break, don't worry I will return to Minecraft but I'm really burned out and...".
One of the few actual advantages that a more corperate approach to gaming has over indies is someone being there to crack the whip and keep them focused (so to speak). I think a lot of people who praise the indie community for it's freedom and creativity (which are good things) do tend to forget about the down side, and how many great ideas have died due to lack of focus, motivation, or developers just deciding they really want to do something else without having the structure of "it's a job" preventing them from just doing whatever whim strikes them.
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That said, I really should get around to trying Minecraft to be honest, but I've been busy with other things. It's taken a while, but it's beginning to interest me a bit more than it used to. Kind of funny how "Zombie Pigs" will get my attention, but a story about someone building Rapture, or burning down their creation with the way fire has been coded won't....