As always, some very nice things in there. 
I like the welcome guide - is that something that custom node authors could use?
Not really had time to play yet but a very minor (possibly non-) issue:
If you have a long Node name, it throws the alignment out in the tree-list.
And one request for a future enhancement - Now that we have evn vars for tabs and groups (nice!), it would be even nicer if the vars were listed in the info bar:
Like settings are for nodes:
And I note that subflows don't include the env vars in the info bar either so it might be nice to have them there as well.
OK, I know I'm being pedantic now but I wonder whether it might be a good idea to add env vars to projects as well? There is already a project settings panel so it might be easy enough to do and could be very handy for some people.
