> Is it or will it be possible with LaTeX 3 to have standard classes 
> (really) do this :

> \documentclass[12.37pt]{article}

> or

> \documentclass[31pt]{book}

Well I don't know about the future of standard classes, but you can do
this already with one the KOMA-classes:

\RequirePackage{fix-cm}
\documentclass[fontsize=39pt]{scrbook}
\begin{document}
abcde \large abc

\end{document}


-- 
Mit freundlichen Grüßen
Ulrike Fischer
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