After six long years, Mew will finally return to North America for a 16-city tour this fall. Half of the stops are on the West Coast of the US, where Mew have seen good support. San Francisco band The Dodos will open for Mew on these dates.
Pre-sale tickets will go on sale on Wednesday, June 10 at 9:00 AM local time on Mewsite. (Pre-sale password = waterslides) General sale will begin on Friday, June 12.
September 20th-24th is open for Mexico, I believe. They might have a deal with the Corona festival that they are not allowed to publish that info yet, or simply they have not booked those shows yet. But it smells like Mexico to me.