With the upcoming content patch, 10- and 25-person Normal mode raid encounters will be receiving a comprehensive set of tuning adjustments to decrease their difficulty.
These changes will allow players, groups, and guilds who have yet to experience the content in Blackwing Descent, Bastion of Twilight, and Throne of the the Four Winds an opportunity to do so.
With the addition of a new tier of armor and weapons, we want to make the previous tier more accessible in ways other than just a shift of currency type, so we are making item level 359 gear purchasable for Justice points in the upcoming content patch.
Read the updated patch notes here http://us.battle.net/wow/en/blog/2723732#dungeons
to see the current list of changes. Please note that all adjustments are subject to change based on the current 4.2 testing on the PTR.