The Microsoft Dynamics GP product team have the most information on their Inside Dynamics GP blog. Please see their articles below:
This version 1 release of the Adapter is only for US English for use in the USA. It is not suitable for use with an International English system at this time. If you require International English, you will need to wait for version 2 of the Adapter. There is no timeframe set for when version 2 will be released.
The adapter is a tool built in Web Services and eConnect - The Adapter is not a product - it is a toolset to help integrate - an out of the box, lightly extensible integration tool (at least for v1). Customers looking for Advanced Integration functionality should still look to ISV’s.
Here are some of the other posts from around the blogsphere:
Microsoft Dynamics GP UK Blog - New Microsoft Dynamics CRM 4.0 (Beta) Adapter for Dynamics GP 10.0
US Microsoft Dynamics GP Field Team - Information About The Microsoft Dynamics CRM 4.0 Adapter for Microsoft Dynamics GP 10.0 Integration Tool - Now Available!
Dynamic Solution Edge - CRM 4.0 Adapter