Well, so Laura is absolutely right ...
"Things like dsync will be GONE in the community version."
That's not right, dsync is still there. Replicator is not, so dsync can't be triggered automatically by dovecot after changes to the mailbox
Well, to be fair :
I said what I said based on the video. And the video seemed pretty clear cut to me ?
Its not there in the form that many (most ?) people would use it for (i.e. with Replicator).
Then Aki came along and said "there is no hidden cache of code going into 3.0 that will not be open source". When the video kind of makes it clear 3.0 Pro with all its new features (e.g. multi-server) is very much going to be a closed-source job. And that the present open-source version is, just like they say in the video, is going to be "supported for single-server use only".
Therefore the waters are still very much muddy overall. The dsync question might well have now been clarified somewhat. But the rest of "how much 3.0 Pro will we see in open source" ? If we're being generous we would say muddy waters, but my gut feeling is the video made clear their direction of travel in that the present Open Source version will continue as-is with updates and support, bu won't be getting any of the fancy new features and functionality that 3.0 Pro is.