You can see the full list of 2018 enhancements here:
Included in the Version 2018 release are several programming fixes, and the list of fixes can be viewed here: 2018 Release Notes
For clients on Version 2017, Product Update 3 has also just been released. The program fixes included with this update can be viewed here: 2017.3 Update
When Should You Upgrade?
We recommend waiting until Product 1 is released in February before upgrading to Version 2018 (as usual, to give Sage a chance to work out any programming challenges in the new version). Until then, we will continue upgrading clients to version 2017. If you have any questions or would like to begin planning your next Sage 100 upgrade, please contact Carina in our office.