Question: Would FPGAs work for mining Litecoin?
Of course it would work but it's currently pointless when you can mine BTC with those same FPGA's and buy Litecoins.
Should the Litecoin price go up significantly it would be worth implementing scrypt in opencl. Scrypt needs more gates per hash so expect a much lower hashrate for LTC than BTC on the same FPGA. mining is a race to the bottom so absolute hashrate doesn't matter anyway, only relative hashrate.