Hi.
Consider small example:
<example file="sample1.tex">
\usetypescriptfile[type-dejavu]
\usetypescript[dejavu]
%\usetypescript[cambria]

\setupbodyfont[dejavu,12pt]
%\setupbodyfont[cambria,12pt]
\starttext
This is default sample text.

Текст для пробы.
\stoptext
</example>

I run context from context-minimals but get error:
...skipped...
!load otf       : loading: /usr/share/fonts/TTF/DejaVuSerif.ttf (hash:
dejavuserif)
!load otf       : file size: 328908
!load otf       : enhancing ...
! LuaTeX error ...text/tex/texmf-context/tex/context/base/font-otf.lua:1243:
attempt to get length of local 'splt' (a nil value)
stack traceback:
	...text/tex/texmf-context/tex/context/base/font-otf.lua:1243: in
function 'enhancer'
	...text/tex/texmf-context/tex/context/base/font-otf.lua:198: in
function 'enhance'
	...text/tex/texmf-context/tex/context/base/font-otf.lua:260: in function 'load'
	...text/tex/texmf-context/tex/context/base/font-otf.lua:1565: in
function 'otf_to_tfm'
	...text/tex/texmf-context/tex/context/base/font-otf.lua:1781: in
function 'read_from_open_type'
	...text/tex/texmf-context/tex/context/base/font-def.lua:476: in
function <...text/tex/texmf-context/tex/context/base/font-def.lua:456>
	(tail call): ?
	(tail call): ?
	...text/tex/texmf-context/tex/context/base/font-def.lua:308: in function 'read'
	...text/tex/texmf-context/tex/context/base/font-def.lua:585: in function 'read'
	...text/tex/texmf-context/tex/context/base/font-ctx.lua:360: in
function 'command_2'
	<main ctx instance>:1: in main chunk.
\lowleveldefinefont ...dimexpr \textface \relax )}
                                                  \edef \somefontspec {at \s...
\xxdododefinefont ...efont {#4}\newfontidentifier
                                                  \fi \csname \newfontidenti...
\applyfontclassstrategies ...\fontsize \endcsname
                                                  \else \expandafter \fontcl...
\synchronizefont ...lse \applyfontclassstrategies
                                                  \fi \autofontsizefalse \if...
\rm ->\ifmmode \mathrm \else \normalrm
                                       \fi
\doswitchstyle ...e \csname \@style@ #1\endcsname
                                                  \edef \fontstyle {#1}\ifmm...
...
l.5 \setupbodyfont[dejavu,12pt]

?
...skipped...
(log file produced by context --nonstopmode sample1.tex is attached).
Same for Cambria.

When I run context from TL2009 all works fine (I got pdf file with dejavu font).

---
WBR, Vladimir Lomov