I know what you mean. The Boltgun is a way too powerful weapon and if any one uses that with the Assault Class it'll be hell for his opponents.
Anyway, here's the list of updates the new add-on will bring:
* Feature - Higher values for Bodycount mode. Players can now create games with 5, 10, 15, 20, 25, 50, 100 and 200 points to increase the time of the mode for 32 player games.
* Feature - Moderators can now create double-points events.
* Fix for persistent squads now working correctly when users using separate Japanese accounts join Friends.
* New loading screens.
* Moderation – Additional powers and functionality for online moderators.
* Fix for Clan Leader leaving his clan before an active Tournament of Clan Challenge.
* Fix for score replication on different clients.
* Fix for a Clan Challenge results displaying a won/lost games as a ‘Draw'.
* Fix for incorrect Tournament timings being displayed for (semi)-final.
* Fix for an empty message pop-up being displayed.
* ‘High Precision Mode' now defaulting when requested.
* Fix for stuttering audio on the Asian version.
* Fix for network error displayed when trying to log in with another users account.
* Fix to reduce network traffic and improve performance.
* Fix for occasionally being displayed an empty background when ‘Join Friend' via Communications tab.
* Exploit – Pyrrhus Rise map boundary fix.
* Exploit – Radec Academy collision fix to prevent players being revived inside a pillar and using it to their advantage.
* Cosmetic fix for Medic Gun visual effects.
* Cosmetic fix for Search & Retrieve object being cloaked by the Scout.
* Cosmetic fix for Scouts body remaining cloaked after being mortally wounded (i.e. headshot).
* Gameplay – Damage from Sentry bots tweaked back on request of the community.
* Collection of minor code fixes.
Source:
Take A Look At That New Killzone 2 DLC