Looks like EA have confirmed the Minimum requirements for The Sims 3 World Adventures.

• PC OS: Windows XP SP2, Windows Vista SP1 or Windows 7
• CPU: (XP) 2.0 GHz P4 processor or equivalent; (Vista and Windows 7) 2.4 GHz P4 processor or equivalent
• RAM: (XP) 1 GB RAM; (Vista and Windows 7) 1.5 GB RAM
• >HARD DRIVE: At least 3.5 GB* of free space with at least 1 GB additional space for custom content and saved games.
• VIDEO: DirectX 9.0c compatible Video Card with 128 MB  of Video RAM and support for Pixel Shader 2.0

*9.6 GB if installing with The Sims 3

Supported Video Cards: Nvidia GeForce series: FX5900 or greater, G100, GT 120, GT 130, GTS 150, GTS 250, GTX 260, GTX 275, GTX 280, GTX 285, GTX 295; ATI Radeon™ series: ATI Radeon 9500 series of greater, X300, X600, X700, X800, X850, X1300, X1600, X1800, X1900, X1950, 2400, 2600, 2900, 3450, 3650, 3850, 3870, 4850, 4870, 4890 series or greater; Intel® Graphics Media Accelerator (GMA): GMA 3-Series, GMA 4-Series.

Please note that the GeForce 6100 and 7100 cards are not supported.

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• MAC OS: Mac OS X 10.5.7 Leopard or higher
• CPU: Intel Core Duo Processor
• RAM: 2 GB RAM
• HARD DRIVE: At least 3.5 GB* of free space with at least 1 GB additional space for custom content and saved games.
• VIDEO: ATI x1600 or Nvidia 7300 GT with 128 MB of Video RAM, or Intel Integrated GMA X3100

*9.6 GB if installing with The Sims 3

Supported Video Cards: Nvidia GeForce series: 7300, 7600, 8600, 8800, 9400M, 9600M, GT120, GT 130 ATI Radeonâ„¢ series: x1600, X1900, HD 2400, HD 2600, HD3870, HD 4850, HD 4870.

Please note that this game will not run on PowerPC (G3/G4/G5) based Mac systems (PowerMac).