Reminder:
476 = LFR MSV
483 = LFR HoF/ToES
489 = N MSV
496 = N HoF/ToES
502 = H MSV = LFR ToT
509 = H HoF/ToES
This time we don't have something like MSV that was a half-tier lower, but we do have Thunderforged. They've also said that they will be bringing ICC/DS style proc weapons back for the last tier again, which will presumably make SoO weapons better than a ToT weapon of the same ilvl.
With that in mind, where do you think T16 will start? I'm guessing 528 for LFR. If they keep the same 20/13 delta, that would put Normal at 548 and Heroic at 561. If they liked Thunderforged enough to repeat it (Orc-forged?) those would be 554 and 567, a nice even 575 with upgrades.