We have player options in WGtE: that doesn't mean that we have all of the potential player options that we may see in the new book. Additional races or subclasses are very, very possible.
And we have none of the quite numerous Eberron specific monsters.
I'll put down that we will see as much new crunch in this new book as Ravnica, maybe more.
Just curious, but what Player Options that we don't have already (not Including Artificer), do you think we will get in it? How many playable races are left for Eberron that haven't been released? Gnolls?