Actually, the full Pictos font from pictos.cc/fonts is in the resources/themes/fonts/pictos/ directory.
The full Pictos font is also loaded by base.css.
The reason the icons show up in Chrome is that the Touch-specific Sencha-touch.css is still using –webkit-mask.
The reason that many of the icons are not showing up for IE 10 is that the Pictos font CSS statements in wp.css are broken (warning) or missing (almost all).