Avalon Hill recently published to their website their first article leading up to the upcoming release of Axis & Allies Guadalcanal. The article is titled Guadalcanal Designer's Notes
A Guadalcanal Diary by Larry Harris. As the intro the the article states the article itself are Larry's designer notes, which are included in Appendix 3 in the Guadalcanal rule book. It's a decent read so check it out. Also available on the AH website are the specs and marketing for Axis & Allies Guadalcanal.