HTCDev unlock and S-OFF are two wildly different things.
I know that the new software has a new bootloader that has so far been resistant to S-OFF.
I know of one person that has tried HTCDev unlock after the OTA and has not been able to get it to work; I haven't seen any reports one way or the other on if anyone else has tried it.
There are ways to get root, but I'm not convinced that they are fool-proof. If you are adventurous and comfortable with that sort of thing, check out XDA. Otherwise, just hold tight until the community develops proven root/s-off/unlock methods for the new software.
Don't buy the snap ring!!
UI- 8 installed and battery is now back to lasting as when first purchased it.
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