This Thursday, April 8th, Apple will be holding a media event in which they will unveil what is being planned for the iPhone OS 4.0. It will take place at 10am Pacific Time on the Apple campus. If past similar events are any hint, SDK details will be announced with the actual SDK available shortly thereafter and the new OS itself available around June, but don’t be surprised if the iPad’s recent release pushes all of that back a little bit.