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There will be a two-tiered Town Portal spell (basic and advanced), and building the Town Portal structure will be required for the spell to function. The basic Town Portal allows a hero to travel between Castles that have this structure. The advanced Town Portal allows you to jump from the global map to the nearest Castle with an Advanced Town Portal. (And then, from the Castle, you can move to any Castle with a Town Portal).
Units and heroes will have their own "luck," usually no more than 6-7% (chance of occurrence). A fully upgraded level 30 hero will have their own luck = 15%. This "own luck" can be increased through spells and artifacts. A "lucky" strike deals 50% more damage.
Amazon announced the game's release date as May 27th.