what it can right now is
 [...]

Aaargh! i've been waiting badly for most of these features!

Some questions: could it be possible to have automatic landscape mode
for floats depending on their geometry? what is the position of the
latex team about putting non-tex features (like color, rotations...)
into the kernel or templates?

More involved: is there any chance to see automatic `picinpar' (say, a
float specifier telling: if width < .4\columnwidth, run the text of
the current par around, but if a page break occurs, or it would
collide with some long equation, then center it [appropriate
parameters to be found...])?

You're talking of floats in the margin, what about `floating
footnotes' in the margin? (i'm thinking of these bible editions where
the commentaries go to the margin next to their calls, and fill the
bottom (sometimes the top) of the page depending on their length
relative to the main text's length...

Thierry Bouche, Grenoble.