This is the TRUE information on the Expansion that is coming, From Playmage himself publicly.
"The expansion is pretty much that was mentioned in the announcement thread. There are new 2 new main story chapters and 3 new WoH bonus chapters added. No new hero skills, but there is 3 new WoH skills. There is no new hero tier, equipment tier or slot, nor new ship tier. There will be a 6th unlockable planet and slightly increase in building/tech/hero level cap. There will be 3 new bosses: 1 ship battle event boss, 1 new ship battle boss, 1 new WoH raid boss. The full set of changes and tweaks in the expansion will be posted when it’s released (currently still on track)."
Sourced from " http://www.kongregate.com/forums/111-ti ... ate-coming "
And this is a re-cap of what the Announcement Thread/Patch Notes said
"The next expansion is currently slotted for roughly around 10/31, and will be a content focused expansion (tentatively will includes new story chapters, possibly bonus WoH chapters, new gem bosses, new raid bosses, new WoH cards, new building/hero/tech levels, feature improvements, etc). I will post a better approximate release date and more details regarding the expansion next month when they become available"