Ok, just got my hands on one.
It is only very slightly heavier than a Touch, and I don't think I would notice a difference in using an Aura.
Wake from sleep, with WiFi enabled is about a second, Touch is the same.
Going to sleep is about 0.5 of a second slower than the Touch.
Dev credits don't seem to be in the About Kobo Aura HD screen, *sniff*