5 - translate common options from preamble (some \usepackage commands)
6 - copy all unknown environments exactly, not just reLyXskip and verbatim
7 - \url, especially \url||
10 - support more stuff from preamble, like \newtheorem
11 - full table support (i.e., longtable and sideways environment in tables)
13 - list environments (like minipage) in syntax.default, along with the
14 number of arguments they take.
15 - better understanding of when we're in math mode. Will (finally!) fix the
16 underscore bugs, allow macro translation and perhaps environment translation,
17 as well as translating \bf in math mode correctly.
20 - graphicx? (in LyX 1.1 and later)
21 - other LaTeX packages
22 - "sloppy" and "fussy" translations. User chooses either to translate as much
23 as possible, which may cause incorrect translations, or to guarantee that
24 (dvi) output will be exactly the same as the TeX file, which may leave
25 more untranslated TeX (ERT).
26 - macro expansion using "tme, a TeX macro expander" by Jonathan Thornburg
27 - better handling of spaces and comments (involves fixing the parser)