Bandai Namco has updated their Steam page for the PC version Tales of Symphonia HD which reveals the minimum and recommended requirements to run the game. These could probably change at any time though given that the game isn't releasing until 2016.
MINIMUM:
OS: Windows Vista 32/64
Processor: Intel Core 2 Duo 2.4Ghz / AMD Athlon 64 X2 5200+, 2.6GHz
Memory: 1 GB RAM
Graphics: Nvidia GeForce 8800GT / ATI Radeon HD 4830
DirectX: Version 9.0
Hard Drive: 7 GB available space
Additional Notes: Gamepad support
RECOMMENDED:
OS: Windows 7 (x64) / Windows 8 (x64)
Processor: Intel Core i3-530, 2.93 GHz / AMD Phenom II X4 940, 3.0GHz
Memory: 4 GB RAM
Graphics: Nvidia GeForce GTX 560 Ti / AMD Radeon HD 7850
Hard Drive: 7 GB available space
Additional Notes: Gamepad support