nUI

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-- 11.1.7.61491.1
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* CooldownBar.lua
> Made adjustments so that nUI's bar is not shown when you choose to use Blizzards cooldown bar.
> It monitors the cooldowns data as is, as they are used for other parts of the interface but the bar itself doesn't update itself

 

Removed old commented out code.
Added event PLAYER_LOGIN to check the cvar value 'cooldownViewerEnabled' and if it is "1" the Blizzard viewer is enabled, so the nUI Cooldown Bar is faded out and hidden. Otherwise it is faded in and shown
Added event CVAR_UPDATE to monitor user changes to the option and does the same thing as PLAYER_LOGIN
Prior to updating nUI's cooldown bar with the latest cooldown information it does another check to see if we are using the blizzard cooldown bars again and skips if we are .

 

You should be able to use Edit Mode to position the frames where you want for your gameplay. Highlight an enemy (but not attack) to get the no bars health bar to appear if you need to fit the cooldown stuff around it ( like I had to).

 

Regarding the new Combat Assistant functionality
I did make an attempt at getting the CombatAssistant Highlight frame to resize to hit the nUI buttons better but alas, it either made no difference or errored out.
I would suggest that you identify the abilities it will suggest (check the spellbook) and put those on your main action bar as the default size for that is enough to fit the new highlight frame.