As for the story plot itself I'm still not certain. There are definitely elements which sound a little simple, like Littlefoot fearing never to grow up (though this is most likely going to be the case ). Still there may be some interesting ideas in it. This new girlfriend of Cera's dad (much as I hate the fact that this is also going to contradict my story "Old Threehorns") may turn out interesting.
I think that the ideas of the plot can turn out both ways, good or bad. If they handle the ideas in a better manner than they handled the good ideas of LBT 7, 8 and 10, I don't see why this one should not turn out good.
One thing I realize is that they seem to aim at kids with divorced parents now. This was written in a review of LBT 10 already.