We will soon work toward putting two groups together for Nax, and scheduling 25-man raids. Everyone needs to keep working on their gear, and working up toward 25-man content. Please be sure to check your gear score at WoW Heroes.
We will also start scheduling more OS and Archavon raids, and look into the Eye of Eternity later on.
Here is a basic guideline for gear scores for raiding:

10-Man Nax: 1,300 bare minimum, 1,600+ recommended.
25-man Nax 1,800 minimum, 2,000+ recommended.