Hi.
Your questions are pretty broad (wide-ranging). I think the best place for you to start is here:
http://www.cisco.com/en/US/products/hw/wireless/products_category_buyers_guide.html#http://www.cisco.com/en/US/products/hw/wireless/products_category_buyers_guide.html?linkpos=4#number_4
There, you'll see data sheets related to each product (WLSE, WLSE Express, WDS, etc.) that should help with many of your questions.
As for some of the more direct questions you ask,
- WLSE detects, locates, and mitigates rogue access points and unauthorized ad-hoc networks.
- v2.9.1a is the latest.
- The Data sheets tell you the difference between WLSE and WLSE Express.
HTH,
-Joe