Hi all,
It appears that EOT font type serving with the 'font:theme' setting format is broken in M2.6 and M2.7, so please vote for: MDL-44850.
and 'SVG' fonts (http://caniuse.com/svg-fonts) are not supported at all, so please vote for: MDL-44854 - and ask for a back-port to M2.6 if you wish.
Cheers,
Gareth