I'd been operating on the guarded assumption that they would make the content, talents, spells, gear, mounts, and scaling work like it did in Classic, but all the other game rules/limits would be kept up to date with the current specs, e.g. no /follow in PVP, enchants on gear have minimum iLevel requirements (no crazy twinking), boss tethering, no stacking Reckoning, CC diminishing returns, etc.