Well, most of you don't know this, but, PR1.3 introduced two things:
Backports of new kernel patches to musb, which really helped with hostmode.
And.. a new bug, if you connect the wall charger to the device, 100% of the time it will stay on 500 (sometimes 550?) MHz, we do not know the behavior of an overclocked device when this bug is triggered on it, if it stays clocked @ 900 (for example), then we're going to see some dead devices pretty soon.
Anyways, hostmode's patches require 1.3's patches to musb, so until titan updates his kernel, it's a no go, feel free to contact his email address (see http://maemo.org/packages/view/kernel-power-flasher and click his name) and request an update.