Reading the changelogs is not that hard.
Although Greg really seems to love indirect talking (where you have to think a bit to find out what he might be saying).
Yeah, "And the price for melting Bedrock goes to THE NUCLEAR REACTOR! Seriously, that should not have happened, people were able to melt down any indestructible Block, ANY ONE!" sure sounds like "Now a hot reactor will melt all surrounding blocks again... O.o
Well, I whined enough, the reactors have been repaired and cooled down so everything is back to normal.