Blizzard invites all PTR players to login on Wednesday and Thursday to help test the Icecrown Citadel 10 and 25-player dungeons.  US players will test Festergut and European players will test Rotface on Wednesday.  Both US and Europe players will test the Icecrown Gunship battle on Thursday.

The PTR 3.3 build 10623 was released and you can download it by launching the public test client.

Blizzard Quote:
We are scheduling raid tests in Icecrown Citadel for October 21-22.

The schedule is as follows:

US PTRs
October 21 at 7PM EDT / 4PM PDT – Festergut
October 22 at 7PM EDT / 4PM PDT – Icecrown Gunship Battle

EU PTRs
October 21 at 19:30 CEST – Rotface
October 22 at 19:30 CEST – Icecrown Gunship Battle

Only normal difficulties will be tested, although 10 and 25 player raids will be available.

The Icecrown Citadel raid test schedule will be very flexible, and can change at a moment’s notice due to build status, bugs, and server issues. Remember that this is the test server, so things can, do, and will break from time to time. Check this forum for the latest Icecrown Citadel raid testing schedule information in the weeks to come.