I dont think any movement, up or down, are priced into the Litecoin price - history has shown that the implicit pricing has not worked so far in the coin markets (and thereby the opportunities).

Looking at the last 12 months difficulty history plus what we have known from previous "halfs" it might be a good place to stash some coins but I would rather bet on the ratio between BTC/LTC than LTC/Fiat (I understand there is an indirect link there). I am not wanting to start a whole BTC vs LTC discussion but the two should live in harmony together - what I would not want to be on the day of the halving is a large owner of WDC and other reasonably large Scrypt currencies, their profitability will probably suffer. Neither would I mine auto profitability algos during those days. I would expect LTC hash rates to fall quite dramatically while some of the other Scypt stuff would be under serious pressure pricewise with hash going up! I personally dont think LTC or the Scrypts will loose much in a longer picture but there will be some volatility!