Congratulations Lydia. I think you will do a great job with this.
On your three areas we need to focus on I have some comments:
1. Building trust in our data. The project is still young and the
Wikipedia editors and others are still wary of using data from
Wikidata on a large scale. We need to build tools and processes to
make our data more trustworthy.
2. Improving the user experience around Wikidata. Building Wikidata to
the point where it is today was a tremendous technical task that we
achieved in a rather short time. This though meant that in places the
user experience has not gotten as much attention. We need to make the
experience of using Wikidata smoother.
3. Making Wikidata easier to understand. Wikidata is a very geeky and
technical project. However to be truly successful it will need to be
easy to get the ideas behind it.
1. I think that if we have to wait till wikipedians trust our data before they use it then we may never get there. Rather we need to make it easier for wikipedians to edit our data than it is for them to edit a local infobox so that wikipedians themselves can improve our data.
2. This means the emphasis is on improving the user experience around the wikipedia interface to wikidata. When that is smooth enough then no one will care that the edit interface on wikidata itself is a bit geeky.
3. If most people interact with wikidata via infoboxes on wikipedia and Vcards on wikivoyage then wikidata becomes much easier to understand - at least the bit of wikidata they interact with. Then users, for the most part, don't need to 'get' the ideas behind the infobox.
From this the priorities, as I see them, are:
A. Finish the remaining datatypes.
B. Develop and test model infoboxes on wikidata ready for wikiprojects in any language to adopt and deploy. (To test these infoboxes we will need to be able to enable wikidata as a wikibase client with a sitelink from every item to its talk page so infoboxes on the talk page work like infoboxes on any other sitelinked page.) Tweak the ontology as necessary to make the infoboxes work.
C. Adapt the wikipedia infobox visual editor so it can edit as 2. above. Deploy the revised visual editor on wikidata first so we can test it before it goes live elsewhere.
This is just my opinion but I offer it as a conversation starter. Is my list very different from yours?
Joe (filceolaire)