I think that's definitely true.
But the thing is, I really enjoyed the so-called "4E preview" books for 3.5. Tome of Battle, and so forth. Wouldn't you think that those books and 4E would be in pretty close proximity on the dartboard?
I do think that these books and 4E are pretty close in proximity on the dartboard. At least, on my dartboard.
I'm willing to accept the possibility that my dartboard (or, I suppose, yours) is one that follows alien geometries, shifting in and out of the mere three dimensions that other dartboards occupy. It's also possible that you and I have differing ideas of "close proximity".