I really like the new scientific book design used by Wiley. You can find an example here. I would like to use this layout style for my thesis, so I was wondering whether there's something available (perhaps similar to tufte-book or classicthesis) implementing this design. If there isn't, any help to identify and code the used fonts, header styles, page numbering style etc. would be much appreciated. Thanks!
The text in the sample you linked is in FF Scala and the headings are in FF Scala Sans, which you could use with LuaTeX and fontspec.
These are both great typefaces, but unfortunately they have only a few basic mathematical symbols and lack a full Greek alphabet, so they might not be the best choice if you have a lot of maths in your thesis. Finding truly harmonious matches would be pretty hard, and the solution Wiley's cobbled together isn't great (notice, e.g., that "ϕ" in displayed and inline formulas has been borrowed from different typefaces).