Is this a thing that is actually playable yet? Was trying to load it earlier but to no avail.

Cool. Tried it out this afternoon on my MacBook Pro which runs a 2.3 GHz i5 and 16 GB of 1333 MHz DDR3 memory, and there's a bit of chug to it, but surely this isn't optimized yet and it's just going to play better and better as we get closer.

Also noticed there are now options to turn off auto-sell of power, and to turn it on for other commodities - since you can't store power without the Energy Storage patent, I assume this is for people who would rather lose the extra juice than sell it for cheap? Or is this feature just for people who don't want to be bothered bulk selling every so often? Does this seriously affect how market prices change?

Oh, one thing, HUGE CURSOR IS HUGE. 

The Mac and PC versions are built at the same time, so they should contain the same features.  You should even be able to play multi-player with PC players.

                                                                                           Jason Winokur

I play a game or two on my Mac every night and it works fine. (Granted, I'm a dev, but I am being honest!) We fixed the cursor issue. The interface latency gets pretty bad, but we're working on that and it should be fixed within the next couple of months.