If you dislike grinding, you'll most likely dislike any MMO that you play. Especially here considering once you finish the storyline you'll be spending most of your time grinding money.
The Unova region was added 8 months ago it still isn't complete, and I'm pretty sure their focus is on dungeons next and they've said Sinnoh is probably the next region to be added. I highly doubt 6th gen is planned for the near future.