Yes. That is a bad idea.
It would not run at all on your device. Its specific to the HTC one at this point in time.
And it won't even run on Cdma sprint HTC ones. Its gsm only.
He does say he is planning on making a version for the s4 once this is finished.
He is also going to help developers port it to their ROMs eventually. For the one that is.
So yes, don't try and flash that, you wont like what happens
For reference tho, it installed flawlessly and I'm actively switching between stock android and sense 5 utilizing the same apps and user data ... It's a dream come true for me. I was super stoked to get the invite email.
HTC One - ARHD GE 2.0 / ARHD 12.1 Bulletproof kernel
Nexus 7 - Cyanogenmod
Tab 2 7 - Cyanogenmod