[XeTeX] fontspec smcp bug

[Andy Lin]

\font\1="Kepler Std" at 8pt\1 %9pt uses Regular for me
Hallo Welt!
\font\2="Kepler Std" at 12pt\2
Hallo Welt!
\font\3="Kepler Std" at 14pt\3
Hallo Welt!
\font\4="Kepler Std" at 24pt\4
Hallo Welt!
\end

This is XeTeX, Version 3.1415926-2.2-0.9995.1 (MiKTeX 2.8) (preloaded
format=xetex 2010.10.3)  3 OCT 2010 11:56
entering extended mode
**keplertest.tex
(D:\Personal\LaTeX\fonttest\keplertest.tex
Requested font "Kepler Std" at 8.0pt
 -> D:/MIKTEXP/fonts/opentype/adobe/Kepler Std/KeplerStd-Capt.otf
Requested font "Kepler Std" at 12.0pt
 -> D:/MIKTEXP/fonts/opentype/adobe/Kepler Std/KeplerStd-Regular.otf
Requested font "Kepler Std" at 14.0pt
 -> D:/MIKTEXP/fonts/opentype/adobe/Kepler Std/KeplerStd-Subh.otf
Requested font "Kepler Std" at 24.0pt
 -> D:/MIKTEXP/fonts/opentype/adobe/Kepler Std/KeplerStd-Disp.otf
 [1] )
Output written on keplertest.pdf (1 page).

Works for me, I get cmr and all four optical size of Kepler Std. I'm
on a Windows machine though, could it be an ICU/AAT thing?
-Andy