It would appear Thai Immigrations has pushed back the "new penalties for overstayerz" until the 29th of August, NOT the 12 as previously announced.
Heavy new penalties await visa overstays - The Nation
I'm not sure if they're still goin' ahead with the crack down on August 12 against "border-bouncerz" or "runnerz" who live here on tourist visas or visa exempt stamps. Some border crossings are already enforcing arbitrary rules about this already.
It would also appear that some Immigrations officer who was shooting off his mouth in another Zone, got corrected about sayin' foreigners need to carry their passports all the time here. There're now reports comin' from the guy at the top 'o the pile, that it ain't like that at all.
About the only advice I can give is IF you're on overstay get it sorted out sooner rather than later. Right now, you can waltz up to the place you pay overstays at Suvarnabhumi, pay your fine, wing your way out to any country with little problem at all. No one knows if doing that after the 29th of August constitutes "turning yourself in" or if you'll skate thru. Good Luck...