Sorry, your grandmother's TA is WRONG. The price being quoted is the regular DDP ($37.99) but the description is deluxe dining. That would mean Disney's giving you like $90 worth of food a day for $38. There is no way in the world (or, more specifically, in the World) that Disney is offering that rate for the Deluxe plan....just because TAs are so-called "Disney Specialist" doesn't mean they know what they are doing.
I have no inside knowledge, but I suspect that the changes will be minimal. Just judging from the boards here, there was an iniital uproar over the changes, but the comments calmed down pretty rapidly....the DDP is not nearly the deal it was a year ago, but still pretty easily saves you 20-25%. They can't really take away much more without losing the real value of using it. My guess is you will see a $1 to $2 increase with the same basic structure.
SkierPete