Is the new wless standard 802.11n is supported in current shipments of Cisco WLC 44XX and WiSM ( 6500 wireless controller card) ?
Also I need to know whether is is supported in WCS 4.1 ?
Yes, 802.11n is supported on the WISM and WCS starting with the following releases in the 4.2 train;
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 220.127.116.11
The following new features are available in WCS 18.104.22.168
802.11n support-The introduction of the Cisco Aironet 1250 series access point, a business-class access point based on the IEEE 802.11n draft 2.0 standard. The access point offers combined data rates of up to 600 Mbps to meet bandwidth requirements. Cisco WCS display screens include a listing for configuring, managing, and monitoring 802.11n access points and their associated wireless LAN controllers.
The newest WLC and WCS 5.0 trains are now released as well :)
Hope this helps!