We already knew that AMD was skipping 32nm and going straight to 28nm for NI while SI was just going to be an upgrade on evergreen and still at 40nm. There doesnt seem to be anything new in that article, SI comes out 1 year after evergreen did and the old lines price drops a bit before the new ones come out, otherwise the old ones would be a horrible deal and would be left in stock forever because the new better ones were cheaper.
I don't think that they will make it that much better, rather than making it draw (even) less power. On one hand I hope that it wont be "that"great, though I am an Nvidia fan, but on the other hand, that would be great for the competition.
I really hope nvidia will make an effort and surprise us with the most awesome card ever!