It looks like Intel has succeeded in bringing down the TDP of its 8-core / 16-thread i9-9900 all the way down to 35W, from its current TDP of 95W! The i9-9900K typically exceeds 110W in real-world usage typically especially on DIY motherboards with Turbo Boost enabled so 35W is quite impressive.
Intel is able to bring the TDP of the new Core i9-9900T down to 35W by significantly lowering the clock-speeds as well as aggressive on-die power management systems. The base clock has been taken down from the normal 3.60 GHz to 1.70 GHz and the boost clock is down from 5.0 GHz to 3.80 GHz. The all-core Turbo clock speed could be as low as 3.30 GHz. Intel has not changed much else you still have the same L3 cache amount at 16MB and the 630 iGPU retains its EU count and clock speeds. The photo of the chip shows a QQC0 identifier on its integrated heatsink (IHS).
This photo and posting was found on Yahoo Auctions Japan, where the seller said that the processor was faster than the Core i7-8700K. The auction has the Core i9-9900T listed for 35,000 yen (about $319.39 USD).