There is no raid this season and yes you can break 660 with normal gameplay. You can get to max light this season (700) from prime engrams and powerful rewards like usual. There is a known bug for some players who are receiving very little to no light increase. My friends and I have been leveling up just fine. Some of us are 660-670s at this point. However at the same time there are a number of people reporting to only receive 650-651 gear or something extremely low. This is apparently a bug; They’re pushing out a quick patch pretty soon.