EA has released the minimum system requirements for The Sims 4. They only shared the specs for one platform, though.
Here's what you'll need to run the game on PC, courtesy of the official FAQ:
You will, however, need a connection to activate Sims 4 the first time you play. You'll also need EA's game client Origin to install and play it.
The Sims 4 is playable in a wide range of languages. EA says that the game will support English, German, French, Russian, Polish, Swedish, Spanish, Italian, Dutch, Norwegian, Danish, Finnish, Brazilian Portuguese, Czech, Chinese (Traditional), Japanese, and Korean. That's the upside to making your in-game characters spout gibberish: it's awfully easy to port it to a different language.
The Mac version's specs aren't mentioned at all. The FAQ says this about the Mac: "We are currently focused on the PC version. We have no updates on Mac at this time." That line is almost identical to the one an EA spokesperson told us in early June.
This doesn't make us doubt that the game's coming to Mac; every entry in the main series has been released on that platform. However, it does suggest that there's going to be a delay between the PC and Mac launches. The Sims 4 will debut on PC on September 2nd.
Mac owners aren't the only ones miffed about The Sims 4. The developers caused some controversy earlier this summer by announcing that pools and toddlers, two regular features of the series, won't be included in the base game. The implication is that they'll be introduced as DLC later, perhaps as part of the Premium membership.