Here is the official announcement from Cisco on the EOS / EOL of the Cisco 4400 controller
Title: End-of-Sale and End-of-Life Announcement for the Cisco 4400 Series Wireless LAN Controllers
Description: Cisco announces the end-of-sale and end-of life dates for the Cisco 4400 Series Wireless LAN 
Controllers.
The last day to order the affected product(s) is June 13, 2011. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance Center (TAC) as shown in Table 1 of the EoL bulletin. Table 1 describes the end-of-life milestones, definitions, and dates for the affected product(s). Table 2 lists the product part numbers affected by this announcement.
For customers with active and paid service and support contracts, support will be available until the termination date of the contract, even if this date exceeds the Last Date of Support shown in Table 1.
Date: 2010-12-13 09:00:00.0