Yup, getting to know more about this little beast as I have more time to spend with it today.
I also chatted with illegear tech support and learnt on few more things.
1) The turbo boost power max is 70w (PL1) and 90W (PL2), and it was tuned by manufacturer.
2) Not recommended to use 3rd party software to undervolt (e.g. Intel XTU), use bios setting instead.
3) The fan button apparently is to switch between game and office mode, game mode will set the 70w/90w tdp limit, office mode will set to 35w/35w tdp limit, disable turbo clock.
4) Office mode also seems to force intel built in GPU even in gaming.
Overall a quick review for me:
1) Size - it is huge ! However, I believe it is one of the smallest in terms of footprint for a 17 inch gaming laptop in the market.
2) Cooling - Very good cooling performance indeed, with some undervolt (I able to get it stable at -155mW it seems, maybe still can go lower), sustainable 3.9Ghz full load, about 85C average. Still need to test more on the GPU thermal performance.
3) Screen - It's gorgeous ! Love the slim bezel.
4) Speaker - Volume is better than I have anticipated
5) Mechanical keyboard is a tad bit noisy, still need to get used to it.
Overall quite satisfied with my selenite.

Next up:
1) Find out if possible to lower down the turbo multiplier to reduce fan noise.
2) Try GPU undervolt
3) Laptop cooler in on the way, will see if it helps to further reduce the temp.
Nice quick review man, I myself got the selenite just recently after sold my Z5 around a week ago and I'm quite satisfied with my purchased.
My initial impression was mostly positive, I'm very surprise that this 17 inch laptop is noticeable lighter then my tanky Z5. My Z5 serve me well but after carrying it around 2 years to my workplace, I think its time to move on to a lighter laptop. Plus with a bigger screen and a better spec its a great upgrade to me. The only thing I'm disappointed at first is the speaker and keyboard. So far after doing some tuning, the speaker sound alright now but for the keyboard, I still cant get used to it. Its feel....weird typing on it