Based on the following, it looks like Tunisia 1943 will run in AH3.
Thus, if you are practicing offline or in a custom arena (such as for bombing or attack), practicing in AH3 is probably a better choice than AH2. It will give you more experience with how the towns and bases are in AH3.
We plan to have the "tunisia" terrain soon for AH3, but in the meantime, you can use the AH3 "italy" terrain -- it has some of Tunisia in the lower left of the map.
If all is stable in the 41 patch,next week we will be ending the beta process and we will go into pre-release testing.
In the pre-release phase
1. AH will install into the final new release folder.
2. Arenas will be live with perks points, and will configured how the current late war is. And scoring will be counted.
3. The only thing we are formally testing for at that point will be installation the into new directory, and host configuration issues, and copying in AH2 settings.
4. At the end of the pre-release phase we will simply stop AH2, and it will auto download AH3 v1.0
HiTech