Very nice. I also like the Research Notes. I had used that on a few profile I saw in the standards. Good to see I was not going off the farm.
It would be great to have the Sources link take similar approach as the biographies and be organized in something like Basic Source and Advanced. Advanced could lean towards toward EE/MLA conventions and use of the Source templates. The basic section could be similar to today.
Or should the Biography section link to Source Styles Guide http://www.wikitree.com/wiki/Sources_Style_Guide
, instead of the Source page. This would steer new user to inline sourcing and better constructed sources, if they like. Blending those two pages may make sense.