Always read the rest of the context, rather than a single line quote.
Its not 2 nodes. Its 1½ node at best and transistor cost is the main issue. Meaning GPU sizes wont be that large. Specially not since the node may last even longer than 28nm.
Uarch wise its not going to change much, if any. But still great benefits in performance/watt from the shrink. While the raw performance may be more limited due to cost.
Probably true if basing judgement entirely on NVIDIA offerings. Slow and steady bumps in performance seems to work for them.
We'll get an idea soon how AMD's future direction may go. AMD may force a larger initial jump in performance for those who prefer NVIDIA.