Source: Sven Co-op
Related: Sven Co-op 2

Yesterday the team of Sven Co-op released some great looking media of Sven Co-op 2 showing us one of their own Co-op maps made by Commando. Apparently not everyone believed that it was a home made map and thought that it was just part of Half-Life 2 itself.
The Sven Co-op team posted the following update with two new screenshots of the map to show that it is a brand new map, based on Half-Life 2, and not just part of Half-Life 2:

Update: And since some people are refusing to believe that these are not directly from HL2SP, here're a couple more. Yes, this is a new map created from scratch by Commando to resemble the Valve map. If you don't believe us, load up HL2 and have a look at the original. There are obvious differences

Looking great, and I for one can't wait to kill some Combine together with other people. Check the Sven Co-op site for more.