It caught my attention because it made me think a little about future itemization. Most of the trinkets in Magisters' Terrace and the Sunwell Plateau have little effects that basically do the same things as other items, but they're done in slightly more interesting ways. There are a few that are almost entirely unique of course, but overall, they're just new ways to do old things. Personally, I adore it and can't wait to see Wrath trinkets and rings.
The Shifting Naaru Sliver in particular caught my attention, because the way it's phrased is so different from other On Use trinkets. It implies that only the caster of the buff gets that buff, so overall, it's the same as something like the Icon of the Silver Crescent. The spell is pretty unique though, so it might be an indication of more widespread applications of this sort of thing later. Being able to flesh out your spell/buff repertoire via a necklace or a ring would be pretty interesting! I suppose Leatherworking Drums do something similar, but this excites me a little more for some reason. Perhaps in Wrath raiding, we'll see people gearing up to complement their party's damage as well as their own moreso than we see currently, thanks to item buffs like these. We'll just have to wait and see.