"Full Bluetooth LE" --- if it works great, but turbos already got a great battery. Not a biggie.
"Guest mode" --- I will never use this. Don't care.
"Face Unlock" --- Worthless feature.
"Raw image files" --- If this matters to you, you should have a better camera anyway.
"Trusted devices" --- We already have this. They stole it from Moto.
As for the ART runtime, you can already enable it I'd you want.
So you think 4 features of dubious significant a great update make? Much to learn for you padawan.
First of all, my disagreement is my opinion.
And Nova launcher is only going to get you 50% of Material Design. You may get close to the 'look', but I haven't seen/heard of anything that is able to allow the interaction patterns of Material Design (beyond notifications).
Fully supported Bluetooth LE has nothing to do with the battery performance, enough of LE is already supported to allow battery improvements. It is about compatibility with new external devices that require full support (Kwikset smart lock for example)
And just because you deem something worthless or unimportant because you won't use, doesn't mean that others aren't waiting for it. In the last VoLTE update, I currently could care less about HD calling (not enough support for it yet) and rarely use simultaneous voice and data, so the most significant part of the last update for me was the changes in battery performance, which had nothing to do with 'Advanced Calling 1.0', but there are a bunch of people excited about it
And yes, I could enable an experimental runtime in KitKat, but I personally would like to wait for the for production version, and I am sure there will be no improvements or advances from that first experimental version of ART. In fact, I am sure that current versions of UNIX and OS X are still using the same UNIX kernel that was used in 1973.
I am not discounting the significance of Material Design, I think it is just short sighted to say it is the only significant change for Android OS. And yes, instead of etc. I could have mentioned other things such as the 5000 public APIs, which should improve app development and stability, as well as a few other items.
But if the look is all that is important, then use Nova launcher, prop your short green legs up on a stool and enjoy. But for me, I look forward to several features under the cover, guess it is just the way I am, otherwise I would still be using my Moto X (2013) instead of a Turbo