Here's the press release that MHC have sent...
Industrial Tones 1.5.3 for Mac OS X has been released. It includes fixes for Snow Leopard and Logic 9 and we have moved to an Intel only codebase with optimizations for Intel processors, Power PC isn't supported any longer. In addition, all soundpacks that used to be optional are now included.
The plug-in has been updated for, and tested on, Snow Leopard and Logic 9. The new version also includes the three soundpacks which used to be optional. Version 1.5.3 for Mac OS X requires Snow Leopard and an Intel Mac.
Pricing and Availability:
Users who own a previous version can update to the new version for $99 More information:

• MHC

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