No buffs for Jayce !
Watch this stream, where a dude asks Meddler questions on different champions. He talk about Jayce at 1:42:30 (almost at the end) where he says that he feels Jayce is "on the edge on being a really good competitive pick, and played in LCK", but might need some item support.
So there we have it. The guy talking to Meddler seems clearly baffled, I was too, and i am sure all Jayce-mains will be. I think new items are a long way off, considering Duskblade just got introduced. So im sorry friends and fellow followers of MC Hammer, he is gonna stay in this weak state for a very long time.