Thanks for asking—yeah we should give people an update! The thing is, there are many different teams working on Ironwood (Shielded Labs, Zcash Open Development Labs, Tachyon Project, Zcash Foundation, and Valar Group). I’ll let the other orgs describe their own work. From what I’ve seen they are working super hard, long hours, and making good progress.
At Shielded Labs our focus has been security, and in particular our new project, which we are calling Zero, of supporting enterprise users (e.g. mining pools, exchanges, and wallets). Our current focus within the Zero project is to help them prepare to safely make the transition to Ironwood.
As far as the security side, it is going well. We’ve been hunting for bugs using a variety of techniques and finding no new serious bugs. That’s encouraging! We’ll post more details about that work as soon as we can.