The PDF's are there, in multiple languages. I downloaded one several days ago. Although it's merely a quick manual rather than comprehensive, but it helps.
I believe the HDMI out is the only detail that we can't figure out from the manual, so we might as well resort to guesswork, for the time being. My guess is that it doesn't have a clean HDMI out, as the camera is "just" a CSC aimed at mere mortals, rather than prosumers. I don't think the GX7 has that feature, either. Only GH3 does, so far.
As for the rolling shutter, the GM1 is not a global shutter camera, so I think it's safe to assume it does suffer from the usual rolling shutter problem. How severely, well, I'm sure there are plenty of sample videos online by now, and one of Blunty's videos in YouTube you can see the shaking test done side by side with GX7 and GH3. As we've established, the GX7 is using the same sensor, so the GM1 should behave the same. So yes, no doubt the same old wibbly-wobbly wabble is there, but suppose it's not as bad as it could. See for yourself in YouTube.
PS.
Thanks for the Hoodman picture, nac. Looks quite doable, then, at least with the Hoodman. :)
For some reason I didn't see the photo when I hit the post button. That post being my first one here, there was the screening delay between my hitting the post button and the message appearing on the stream. No biggie, but I just thought it may look a bit weird, as I was asking for photos seemingly after someone had already done just that.
If I end up buying a G1, I think I'd like to go for the Swivi one, though, and amplify the quirkiness of the setup. If someone has already done that, please feel free to post a photo of your rig. Just for the heck of it.
I've been beating about the bush and pacing around the idea of buing a GM1 for several days now. I'm not sure if the GM1 is the most practical of choices in my case, but I can't help feeling very tempted. Decisions, decisions... :)