This IS the advance notification and is why we're not discontinuing hosting a websockets enabled cluster of steemd's (wss://steemd.steemit.com) - at least not yet. We want to give everyone fair warning and a chance to update their libraries before discontinuing this service. It's never our intention to leave behind 3rd party developers. If you need help updating your applications or
steem library feel free to reach out to me directly on steemit.chat and I'll do my best to answer any questions you may have. This will be a transport change, not an API change - anything that worked over websockets to steemd will work over http/jsonrpc, generally with fairly minimal adjustments. We made a commitment earlier this year to communicate as much as and as far in advance as possible for any API changes or anything else that could effect third party developers. We will continue to notify everyone about any upcoming changes in advance. Steem on.