Fot those people who are wanting to see the trailer for KH3D on the eShop I got an interesting notification from them on my 3DS:
"Througout the week, visit the Nintendo eShop for information revealed at E3 about upcoming games for Nintendo 3DS and Wii U systems. For a limited time, you can also download trailers for select Nintendo 3DS games."
Now this doesn't mean one of the trailers will be KH3D's, but it sure fits the description of an upcoming game shown at E3. And they do often show third-party trailers. :3