I have 3 points to write here.

1 = Mine fails to work like @MTal says.
2 = With Jupyter, capture failes once per every two trials.
3 = How to get SD card initial image to be dd-ed?

1:
From OSX, I successfully connected to my unitv2 bought at Japanese store (switchscience) last week, but like @MTal says, loading does not stop like below.

2:
Actually I managed to see the UI once, but could not try camera demo, so I tried Jupyter mode, and successfully ran samples, but camera capture failed once per two times using sample code embedded:

import cv2

camera = cv2.VideoCapture(0)
ret, frame = camera.read()

if ret:
    print('Capture Successful!')
else:
    print('OOps, we get some trouble!')

I'm not sure this is related to infinite "loading...".

3:
I'm not sure this is caused by SD card corruption or not,
but if anyone know how to get initial SD card image, I'd like to flash by myself to try fixing it.

Thanks.