If anybody is here looking for information about what happened to Opera Coast because Opera didn't post any news about it, here it is: Coast has been discontinued according to some ex-employees/business contacts/friends(?) on Reddit.

kaysb: Opera removed of most of the developers positions in the Oslo office last year, and with that, killed development of things like Coast.

gsnedders: AFAIK, most of the people heavily involved in Coast left long before that, and there was some small skeleton team left. But I could be wrong, it's been a long time since I've spoken to anyone who was much around it.

demonstro: Currently working with one of the designers. They're all out. An Android build was just around the corner, but now it will never happen.

kaysb That could be. My memory of that period is already a bit foggy
I quit my job at Opera 5 days before the rest of my team (Core Services and Operation, or what ever the name was at the end) was told they would shut down the development in Oslo.
I did have a veeery small part of Coast; I designed, implemented and maintained the server side of Coast Card, the bookmark sharing built into Coast.
I hope the rest of the company is still doing great, but I must say that it is a bit of an eye opener to see the company from outside. Or, to be more precise, not see the company at all, even as a interested hard core user. After they removed the first-run page informing about the latest changes etc. there is very little that engages users in the product.