I played around with Seal of Insight on a dummy recently, and I'm noticing it's procing much bigger heals than the last time I checked. The scaling of the heal on hit seems to be very high, even the proc from Dancing Steel seems to take the heal from 5-6k per hit to 7k+, with all cooldowns popped each proc heals for 11k... it also does not seem to be affected by any of the recent healing nerfs, neither the PvP power nerf or the Battle fatigue nerf.
The same goes for Glyph of Battle healer... it was never affected by PvP power, so now that PvP healing was nerfed for Ret, the Glyph and the Seal have received a very high relative boost, not to mention the above discussed excellent scaling. Anyway, I'm sure it's not too significant for PvP, but it's something during these dark days of Ret healing.