Empower from the tree Chronomancy/Spellbinding does not seem to affect Temporal Hounds. I have it level 3. It should increase my spellpower by 32% I think. The Temporal Hounds stats display does not change at all when I empower the spell even though it scales with spellpower. Also, I can empower Spacetime Tuning, Temporal Retrieve and Haste which are not affected by spellpower. This isn't really a bug, but I think it would be nice if those spell wouldn't be selectable by empower since empower has no effect on them.
Other spellbinding effects seem to affect Temporal Hounds. Spellpower also increases the hounds stats.
EDIT: Also Temporal Bolt does not damage the hounds unless you target an hound directly. If you use the boomerang effect it passes through your Hounds without harming them. (Which is nice! I'm just not 100% sure it's intended since the hounds get bonus temporal resist when you increase the skill level)
EDIT2: Temporal Fugue in Chronomancy/Timeline has a typo. It's written "recieved" instead of "received".
EDIT3: I'd like to know if Resistance Penetration affects the hounds. =)
One more EDIT: My character leaves a strange after image. Is Celerity from Chronomancy/Speed Control doing this? Looks a little buggy.
http://oi57.tinypic.com/20p4x06.jpg (The after image only appears for a moment).