No kidding. The lack of Dragonborn and the existence of Chessenta have been bugging me since the Grey Box and I, for one, welcome this long wished-for change.
Okay, but all bitterness about how the FRCS isn't remotely the Forgotten Realms that Ed Greenwood campaigned in any more aside (really, they should have just released a whole new setting if they wanted "Core 4E World"), what I'm hoping is that Wizard's decision to murder one of their better campaign settings was a lamb sacrificed on the alter of "launching 4E with maximum brand recognition" and doesn't represent a corporate strategy to mutilate everything that TSR ever published. If they hack up Ravenloft, Dark Sun and Planescape as badly as they messed up FR*, I might have to consider direct action**.
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*Just understand; the 4E FRCS isn't necessarily a bad setting considered by itself; it's just that it's a travesty when you consider what was sacrificed to make it. Sort of how we might feel about a very competent modern painter who painted directly over a Van Gogh canvas to make a self portrait. "
What were you thinking man!!!???"
**Probably just a really mean e-mail. And possibly heckling at GenCon.