Using Sage 5.9 notebook, the output of show(r.summary(range(10))) shows the LaTeX source, not the rendered LaTeX.
N.B.: My first try generated an error stating that R package 'Hmisc' was required. From sage -R, the command install_package('Hmisc') seemed to go fine. The notebook was restarted and r.installed_packages() showed 'Hmisc' was indeed installed.
Is there some other trick to render R LaTeX output in the notebook?