When we started FLL seven years back,  2nd generation NXT was new and powerful and now the 3rd generation - EV3 has more powerful processor and storage choices. All legacy sensors should work and NXT platform still available till 2015. Both versions are allowed in 2013 season.
 
Take a first look at the three of the best EV3 - projects. 
 
http://news.cnet.com/8301-10797_3-57584756-235/electric-guitar-dinosaur-top-new-lego-mindstorms-ev3-models/?part=rss&subj=news&tag=title

Want to know more about EV3 brick. 

http://ces.cnet.com/8301-34441_1-57562323/get-ready-to-program-legos-mindstorms-ev3-robots-are-here/

The EV3 is backward compatible. FLL and FTC related question fro NXT and EV3 cab be found in the Lego Education website. 

http://www.legoeducation.us/eng/misc/comparingEV3andNXT.cfm#loc=existingUser_w2_jan2013

Have fun reading.

Desh Deshmukh

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