The store is also featuring 14 Spanish language newspapers as well as exclusive content and both original and translated works, including Dora the Explorer and Go Diego Go books in Spanish, Kindle Singles by authors such as Kurt Vonnegut and Susan Orlean, and popular English-language books translated into Spanish, such as The Hunger Games series and the Twilight series.
TBH, this isn't a launch so much as it's a reorganization. Amazon has been selling Spanish language ebooks for years now, and they have even been sorting them by language for all that time. So what Amazon really did here was to add new pages that made it easier for you to find and buy the ebooks.
Of course, that's no small thing. It helps Amazon catch up with B&N, who has had Spanish pages in the Nook Store since last spring. It also gives us a hint about Amazon's future plans. A few months back I predicted that Amazon will launch a bunch of local Kindle Stores in Latin America in the near future. I would say that today's news shows that Amazon is clearly working in that direction.
On a related note, while looking through the Kindle Store I noticed one detail that Amazon hasn't pointed out. The press release mentions 14 Spanish language newspapers from SA, but it turns out that Amazon also offers subscriptions to 7 newspapers from Brazil. They're likely Portuguese, not Spanish, so they're not that relevant to today's story, but I find it telling nonetheless that Amazon has recruited them.