A few things.
First, I wasn't completely happy with the Assault detachment, so I tidied up the highlights here and there and added white rims to the exhausts of the jump packs. I've updated the photo in the previous post, although it's quite hard to see the exhausts from the front.
Second, I've gone back and updated the Terminator detachment slightly. Having decided to adopt the Codex convention of marking Sergeants with red helmets (if they're wearing helmets at all), I decided to apply this to the Terminators as well. Terminator Sergeants now have red helmets with a white stripe.

(Click for larger image.)And finally, I have painted up a detachment of Devastators.

(Click for larger image.)I'm vaguely concerned that it may be hard to spot the extra heavy weapons at a glance. The lascannon is fairly conspicuous, but the heavy bolter may not be visible without examining the model closely. So I'm vaguely considering doing something to try and make the Devastator units more immediately distinguishable from Tacticals. One possibility would be to give them white bolter casings instead of metal, but I'm not completely convinced.
Assuming I don't go back and change this formation, I have one more Tactical detachment to go before this company is finished.