I'm not sure its an issue with forge. Both me and my friend who's crash report I posted are using the same pack version with the same version of forge. We are going to manually update it and see. It seems to be crashing as soon as the splash screen hits phase 2 of initialization. We are going to try and point the profile to use java 7 instead of the packaged java 8.
Edit: Using various compatible, older, versions of forge are still throwing up the error is trying with java 7.
A friend of mine is getting a crash midway through loading. Has tried doing a clean install of the pack etc. Crash report is here Crash Report. I just downloaded an installed the pack and its running find which is rules out any issues with the download.