Dll

I'm always keen to get information out as soon as we have it fixed on our end. There are pros and cons but the earlier the feedback, the more chance we have at addressing it and making sure we've not missed any angles. Give it a few months and the v5 codebase will be much stabler and we'll be more reluctant to make big changes.
Some of the tools we're still actively working on, and stuff like theme tools are only about 80% complete, so there may be some gaps between blogs but we'll post them as soon as we have them ready.
Not exactly, it's more like the JS event system, you can listen in on events and execute your code when those events are triggered.

I'm sure there are others who have found in nice to get a glimpse 🙂 No matter which way we do this, releasing everything in a single blog would just be too much. And actually, we announced one yesterday, then release another today. These things are always a "damned if you do, damned if you don't" kind of thing. If we say nothing, some dont like it, if we say something, some wont like it.
There's more to come, as mentioned.

Maybe it would have been a plan to hold off announcing this 1 tool until you were ready to announce the rest, or at least some of them.