You, know, I very much preferred the earlier keyboards too. I made way less mistakes.
I think they may have removed the feature whereby the system predicts what your words will be and change the target touch zone for the next best key. Before, for example, you typed "chanc", then went to press 'e', the touch zone extended to the keys around it. That is, you could slightly press 'r' or 'w', and it would show an 'e' (you could see the little pop be an e).
I think the more fully featured autocorrect and autospelling is perhaps a bigger task on the system, so it is definitely changed somehow.