It would appear, based on their recent hashrate jumps, that BW.com has their B-Eleven in production, for internal use on their cloudmining contracts so far not for sale.
Bitfury has demoed a chip, but no miners around yet that the public has access to. It's possible some of their "partners" or mega-buyers like MegaBigPower have started initial deployment of that gen of Bitfury gear, but they're very quiet about it if that is the case.
No hard word on when or how much out of Innosilicon yet. There's still a lingering question as to "is BW.com/LKETC using their own chip design, or are they using the A3 given the longtime LKETC usage of the A1 chip in their miners" that hasn't been firmly answered yet.
Bitmain - probably hasn't hit tapeout on that generation yet, but they tend to be sorta quiet most of the time 'till they're very close to deployment. Definitely not REAL soon given that they're still pushing new S7s pretty hard.
KnC - I seriously doubt their claims, they have announced they have their Solar chip in production but no significant move in their hashrate since that announcement.
Spondoolies - SP50 announcement was nice, but their financials are looking seriously like "bankrupt and dead in 2016" at this point.
What happened to A3?
Good question! A3 is actually gonna be a replacement of A1, and will be rolled out at the same time with A4. So A3 and A4 share the same roll out time, and A3 will have sub 0.2w/gh btc mining performance.
https://bitcointalksearch.org/topic/innosilicons-a4-dominator-12wmhs-14nm-asic-and-miner-open-for-partners-1251930