There's nothing in the specs, but given the large-size CMOS sensor, I suspect that the GH1 is going to have a rolling shutter as well, and consequently will be susceptible to the jello effect, too. Oh, well, at 60fps, maybe at least it will be firmer jello.
This is, of course, a major concern. I am optimistic for a couple reasons:
-- the interview with the panasonic tech guy at dpreview said they were well aware of the problems with other DSLRs and video and they didn't want to repeat them, they wanted the best video.
-- the sensor is a new one, and I believe I read somewhere that part of the purpose of going with this sensor design was to change the electronics on the sensor to to give the pixels more light area and to also improve the rate at which they are able to pull data off of it.
-- this issue is much higher on the "critical list" for video than noise from the autofocus and OIS in the lens, yet they went to great trouble to fix the lens noise...
I have a 50 f1.4 with me today for PMA and will use it for real like situations and show you how it does.
Did you get a chance to put try it out?