Ok, so I know this will eventually get buried in the forums but I thought I would attempt to give a little basic info here. Right now the QA section is flooded with people that have flashed and are now soft bricked (have problems but can recover)...
Looks like Dialer themes will be do-able, just going to take some effort. Lots of little changes with png names and locations are taking some time to track down. Making progress though.
The Glitch version of the 0.5.1 update, or you flashed the ICS Glitch that they're using on Onecosmic's ICS?
Running the Glitch that's built in 0.5.1.
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To get themes working. Like I said earlier, find the theme you want to use and copy to a test folder somewhere. Rename the MTZ to a zip, and extract. You can manually copy and paste the com.android.systemui from the extracted folder to /data/sy...
For anyone that wants it, just threw together a MiuiSystemUI.apk with Center Clock. Copy to phone and push to /system/app.