I'll bite. And if they don't release something this summer? How long will you wait and what will you do between now and WHENEVER? Of course, you can always wait - you've probably been without an ereader much of your short or long life so a bit longer probably does not matter. I like my k3 and it has increased my reading habits.
In other threads, I've seen where folks have sold their k2's to someone interested in the cheaper/used/older tech and purchased a newer unit so you could follow that route if the k4 appeals to you.