I had a look today what is missing: basically, entering and latexing € works with utf8, latin9 and cp1251 (also latin10 and others in theory, but they're not in the combo), provided that \usepackage{textcomp} is entered manually to the preamble.
I tried to load that automatically (i.e. require it), but failed (I tried at simpleTeXSpecialChars in paragraph_pimpl with code point 0xa4, to no avail). Any pointer? I'm still lost in the new unicode universe. I really think we should get that to work for 1.5 for image reasons, if possible. (also, we should ponder changing the default encodings of the latin1 languages to latin9. At least for German, that would make sense). Jürgen