However, "total radio silence" is not fair. We're very active, and very vocal, about our status updates and progress we're making on the Flickr Help Forum, on our blog, on Twitter, etc. In particular, Flickr now has a CEO (me) who frequently engages with the community and customers to keep them informed, something Flickr hasn't enjoyed since ~2005.
We even have a status page, with frequent realtime updates, which I believe is a first for Flickr: https://status.flickr.net
There is a single feature, Camera Roll, which is still offline undergoing maintenance. No-one is happy it's offline, but it is what it is. It relied on technology internal to Yahoo, which we had to leave behind when we recently exited their datacenters. Given the hard deadline and the vast size, scale, and scope of the Flickr service, we managed to move everything (while keeping it online) except this. It will be returning shortly, but it's not quite ready yet.
I hope you'll stick it out with us, because we're nearly done migrating one of the largest web services on the planet, which means we get to focus on building again instead of just copying. The future is bright.
Disclaimer: I'm the co-founder, CEO & Chief Geek at SmugMug, the company that acquired Flickr from Yahoo last year.