Sorry don't have a changelog.
be aware this version is beta, and i had a problem with it , it locked up the mouse right click functions , this was related to its resident protection mech , i have reported this problem , and they have acknowledged the issue, are are attempting to fix it
but other than that it seem great , but i will wait for final release b4 getting it as 1.2 is doing fine for now and has no bugs
Downloading rc5 now. First thing I did with rc4 was disable TeaTimer (resident protection). I'll do the same with rc5. Btw v1.2 is NOT being updated. While the rc's are. SSD rocks! But as mentioned this isn't a final version.