This is a variant of eurofurence with more "classic"
proportions (similar to renaissance typefaces), reminding of
the sans serif fonts of the 1920s and 1930s such as Futura.
The letters bdfhkl have significantly taller ascenders, leading
to a less compact, more elegant appearance of the words.
(Incidentally, most work went into the Greek letters here,
where ascender resizing is not just a matter of elongating a
stem.)
I also reintroduced the proportional oldstyle figures here (which have been part of eurofurence in 1998 already). These don't stand out as much in body text. This also meant to vertically recenter the math operators (such as +<=>).
eurofurence classic comes in the same styles and with
the same character set as eurofurence.
Don't mix oldstyle numerals and all-capital headlines - use eurofurence for that purpose instead. Also the monospaced numerals of eurofurence are a better choice whenever you want to align numbers in vertical columns.
I wouldn't suggest to mix both eurofurence and eurofurence classic in the same document unless you absolutely know what you do :) Perhaps using eurofurence for headlines and eurofurence classic for body text could make sense.