Can turn them off in Settings -> Graphics -> Draw bullet shadows.
Other changes:
- Implement nickname-based authentication for LAN parties so local ranked matches between friends can be played without Steam - this means the match will be properly frozen in case somebody's client crashes and they'll be able to reconnect to continue.
- Disable packet reliability for Web builds - it was mistakenly enabled. This will improve Web based experience.
- Upgrade freetype2 to fix a security vulnerability.