Blizzard has noted that they're looking to nerf Silence in an effort to make buff decks better: http://www.liquidhearth.com/forum/hearthstone/506312-monk-visits-blizzard-changes-coming-to-standard
I'm expecting no new Silence cards, and nerfs to Keeper and Owl at minimum.
Speaking of Keeper of the Grove, Blizzard is looking to weaken Silence overall. According to developers, it felt strange when you played a buff deck and it just happens to get countered because you happen to have two Silences innately built into your Druid deck. Extrapolating this could point to cards like Ironbeak Owl and Spellbreaker receiving nerfs.
I'm expecting no new Silence cards, and nerfs to Keeper and Owl at minimum.