A generation of Pokemon typically lasts between 2-4 years, and in a recent teaser for 2016′s movie a new Pokemon was spotted, so the potential for the 7th generation to release late next year is fairly high.  6th gen changed a LOT for the series, but as with every generation there are some ideas that didn’t make it in for one reason or another, and at least some of those will make it in to the next generation.  Personally, my list of top wants from the 7th generation include:

• A new region based in part around Central Europe with connections to Kalos, featuring a variety of locales and a massive lake that forms a sort of inland sea.
  
• 100+ new Pokemon, including a few, FEW normal evolutions of previous Pokemon.
  
• More Mega evolutions!
  
• More version exclusives, including new legendary water types in the inland sea i.e. a sea serpent in one game and kraken in the other
  
• Less constrictions on the Pokemon that might appear.  Make Pokemon likely to appear in certain areas, but include more unusual or rare Pokemon all over with small encounter percentages
• More gender/location dimorphism in Pokemon from previous generations and new Pokemon
• Less constrictions to where you can go and when, not a complete abandonment of the route formulas, but open things up more and let trainers explore!
• More trainer avatar customization
• An expanded Friend Safari
• A legitimately threatening enemy team
• A rival who is aggressive and competitive, more akin to Green/Gary and Silver than more recent rivals
• Starters that demonstrate two type triangles, as they did in 6th gen, but with secondary typing that works in inverse to their primary typing i.e. Grass/Steel, Fire/Fairy, Water/Fighting
• A post game that, with Friend Safari and version exclusives, allows access to all previous Pokemon outside of event exclusives

There’s more that I want in particular, but those tend to just be type combinations/Mega evolutions/types of Pokemon that I would like to see.