Today is an exciting and scary day for me - I and two others have been working on adding support for a fully-fledged campaign system to Portal 2: Community Edition, with additional support for sourcemods (enabling an easier pathway for mods to get onto Steam).

This has been in the works for a year; they are live now to all closed beta testers as of today, alongside a public preview of volumetric lighting and a number of additional quality-of-life changes!

A feature overview and changelog is available here.

If you want to try these out for yourself, feel free to apply for the P2:CE closed beta at https://p2ce.org/beta.