Nintendo will be holding a 3DS Developer Conference on May 17th, 2011. The conference is open to a small, select group of people of the gaming industry. The conference will include topics such as the upcoming eShop, digital distribution, apps, internet connectivity, StreetPass, tools/middleware updates and more. More details, can be found on their website.
Source: Game Crunch

I hope the actual eShop comes out a bit after