According to the B&H product page, quality priority is 2 seconds and shoot-time priority is 4 secs:

Quality Priority (2 seconds):

• 240fps (1,824 x 1,026),　
• 480fps (1,676 x 566),　
• 960fps (1,136 x 384)

Shoot Time Priority (4 seconds):

• 240fps (1,676 x 566),
• 480fps (1,136 x 384),
• 960fps (800 x 270)

Compilation of slo-mo videos

looks very promising - http://www.eoshd.com/2015/07/sony-rx10-m2-first-part-of-my-review-and-a-mini-comparison-with-the-a7s-and-canon-1d-c/

Second part of review by Andrew Raid

http://www.eoshd.com/2015/07/100fps-to-1000fps-a-detailed-look-at-slow-motion-on-the-sony-rx100-iv-rx10-ii/

In stock at http://www.amazon.com/gp/product/B00ZDWGR8E/

@J_Cooks This video made me want to replace my sold GH3 for this camera ! I am wonder how you deal with sunlight . Does the ND filter built in offer good configurations ? Can we lock focus or lock focus/exposure like any normal camera ? What do think about low light performance ? Do you think the sensor offer good DoF in order to achieve the filmic look with blurred background ? Thanks so much for this video !

Do you people think this could work well with the a7s? Or will the smaller sensor and reduced dr make it look too camcorder, despite the tech specs? Thanks

@flablo

I dont have the camera yet, but Kristoffer Davidsson, the guy that created the video I just posted says:

"Yes, it's the same S-log2 as the in a7s (as far as I know) , cuts very well together at least."

If that helps.