Will updating to Android 4.4.3 cause my phone to lose all its application data ? If so, how can I prevent this?

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http://android.stackexchange.com – I own a Nexus 5, and I wish to update the device firmware from Android 4.4.2 to Android 4.4.3. When I do this, will it wipe all my phone data (i.e. essentially perform a factory reset). I know that my Play Store account has a record of all the applications I use, but I suppose the application data will be lost. I'm specifically concerned about Asphalt 8, in which I've reached a pretty advanced stage. I've heard that Android apps that have data backup enabled save their data remotely in the cloud, but that this doesn't apply to game apps like Asphalt. So my question is, 1. Will I lose all my a (HowTos)