Was just about to post this thread, will put it here lol:
Photos of Switch 2 factory prototypes have leaked on a Chinese website
This is not official so not 100% confirmed but it looks legitimate to me. The actual image of the circuit board compared to the 3d renders posted lines up perfectly. You can see the additional USB-C port next to the audio jack and the cartridge slot so the 3d renders and the circuit board photo are for the same product. Of course it could be faked but I'd put money on this being a legitimate leak. Pictures below.
Specs
SoC: GMLX30-R-A1
Ram: 12gb LPDDR5X 7500MT/s (MT62F768M64D4EK-026 (6GX2 dual channel, LPDDR5X, 7500 MT/s))
Storage: 256gb UFS 3.1, 2100MB/s (THGJFGT1E45BAILHW0 manufactured by Kaixia)
Basically just product codes below, will be cooled by a dual fan setup though.
Audio chip model: Ruiwu ALC5658-CG.
NFC reader model: NXP IPN7160B1HN
Built-in microphone model: CMB-MIC-X7.
Dual cooling fans, model BSM0405HPJH9 and BSM0505HPJQC (copper gaming heat sink).
Video signal conversion (DisplayPort to HDMI) must be chip model; Ruixian RTD2175N must be chip (support HDMI 2.1).
Network chip model: Ruiming RTL8153B-VB-CG and Gigabit Ethernet chip (the base has a network cable interface).
Microcontroller chip model: STMicroelectronics JSTM32G0OB0OCET6.
Video game console protective case model: HGU1100 (size: 206 x 115 x 14mm, made of plastic).
Speakers: MUSE BOX-L and MUSE BOX-R (two-channel stereo).
Console
Joycons 2.0
Tablet Size Comparison (Switch 2 vs Switch)
Circuit Board & Render Comparison