The only extra thing you can really do is take your character from one to the other and obtain the extra skills and thats about as far as it goes for relation between the two games, no quests that spawn across or involve having the two games besides mhelenos request.
Dramatic inpact on items worth due to new mods and skins in each new game which overpower and unbalance the past chapter.
whats going to happen when everyone moves onto chapter 3 all this faction farming will be a lost cause everyone will flood to chapter 3 and it would of been a wasted effort, I hope in the next chapters anet decide to make the games have more to do with each other, and instead of dropping each chapter into the dirt maybe to take some time in explaining or patching up holes in story or having it mean something in the next.
whats wrong with adding content to the past lands it can still be done it anet wanto make money they could just include it in the next chapters.
Example bonus material for chapter one and 2 could be sold through chapter 3.
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