IT WILL ABSOLUTELY BE AN IMPROVEMENT. There is no denying that. However, in practical terms, if one treats their iPad roughly, say, in the same duffle bag as a bowling ball OR with books and/or irregular large hard items in a soft backpack, .5 of a mm is not going to make a difference.
Where it absolutely WILL make a difference, though, is the case where someone actually scientifically measures exactly at one point pressure or torque will permanently deform an iPad. The newer iPad will likely be able to withstand a larger amount of pressure. However, it’s of no practical benefit as the amount of the delta will likely be so small… hmm, I wonder if it’ll actually be easier to bend because of the removal of the old LCD light that ran entire length of the iPad??