I honestly have no idea what they could have changed because the GoogleHome APK does next to nothing. All the code for the GEL is actually in the Google Search APK. All this GoogleHome.apk file does is provide a bridge to Google Search and give you the option of running the GEL. The reason the file is 12 MB is basically all the wallpapers that it includes. That's really it. I mean, obviously they changed *something*, but I'd be shocked if there were any performance improvements or bug fixes. Very strange indeed. Thanks for posting, nonetheless. It's always good to stay on top of the latest versions of stuff like this.
Every OTA update for every Nexus and Google Experience device since the Motorola Droid at http://www.randomphantasmagoria.com/firmware
LG G3 (LG-LS990 / Sprint)
:: LS990ZV4 (Android 4.4.2 / KVT49L)
Samsung Galaxy Tab 4 8.0 (SM-T337A / AT&T)
:: T337AUCU1ANF4 (Android 4.4.2 / KOT49H)
Samsung Galaxy Note Pro 12.2 (SM-P907A / AT&T)
:: P907AUCU1AND7 (Android 4.4.2 / KOT49H)