Jason Kendall got everything totally correct. I called Easton just a few seconds ago to verify what they would be offering. They are only doing the 4 sizes that Jason mentioned, and he got the size conversions correct, exactly as she said. Sucks for me, as I have been shooting the 1916's, and they are perfect for my setup. I was getting the shafts for fairly cheap, cutting off the swedge taper, installing a G Nock Uni bushing and G nock - came out perfect for me, and I really liked the setup. You can do the same for the other sizes as well, which is probably what I'll continue doing.
Unfortunately, the $20 rebate does not apply to bare shafts - just fletched. Here is the cut and paste from their website:
$20 mail-in rebate* when you buy one dozen EASTON XX75 Gamegetter 300, 340, 400, or 500 fletched arrows.
All the best,
Glenn