M8 Snapshot builds of CM 11 are being pushed to servers now, according to a blog post from the folks over at CyanogenMod. There are quite a bit of changes and it is based on Android 4.4.4.
Milestone builds are usually more stable than Nightlies, so you should give it a try if it’s available for your device. Not every phone and tablet that gets a nightly build will get the M8 treatment, especially if the managers are having trouble with any particular hardware or software issues. So check here, and see whether it is available for your device. If you’re going to flash this, Don’t forget to flash the Gapps to get the Google Apps.