With screen resolutions increasing in pixels Google is promoting the use of XXHDPI and XXXHDPI, icons in the official documents.
http://developer.android.com/design/style/iconography.html
But in their official Android download packs they only go up to XHDPI.
http://developer.android.com/design/downloads/index.html
Do they expect us to create these icons when can't be bothered too?
What are other developers doing especially for the Holo icons, are they creating it from SVG.
Update
If you download the the Icon Pack and not the "all pack", it now contains XXHDPI icons but still no XXXHDPI.
http://developer.android.com/downloads/design/Android_Design_Icons_20131106.zip
Since they provide ai file, which is vector-based, you can export any scale you want.
Btw, Nexus 5 (and many other 1080p phones) is already XXHDPI, so you are supposed to provide at least XXHDPI icons.