the specs on Cascade’s site are wrong, the prolite 3 is 1 inch thick and weighs more than the Z-rest. REI has the correct specs on their site. and yes, it is a self-inflater. it replaces their Ultralite model.
BackpackGearTest.org is testing the new Prolites, it looks like a few of the initial reports are available online. they’ll be testing them over the next 6 months, but if you’re starting a thru soon then that’s a bit too long for you to wait! here’s the address for the reports:
http://www.backpackgeartest.org/reviews/Sleep%20Gear/Pads%20and%20Air%20Mattresses/Therm-a-Rest%20Prolite/
(disclaimer: i am a tester for BGT.org, but not on this test series)
tarbubble