The only mention MtGox has made to support your statement is a single tweet that promised nothing. MtGox won't carry LTC anytime soon - there is absolutely no use for them, they are just a trading commodity like all the other 100 alternative cryptocurrencies. MtGox is the trusted exchange right now, to carry LTC would be to stoop down to a site like btc-e.
I was excited about buying LTC too. Short term, there is no reason for them to rise though, besides if MtGox carries them, which I explained above. Long term yes it could be a good investment, because if Bitcoin gets BIG there has to be a secondary (imo).
Comparing Litecoins and bitcoins as silver and gold makes no sense. Bitcoins are divisable by a huge number, so it's not like you will be unable to get down to $1 or even $0.01 in a transaction, and they are actually useful. Litecoins are worth less than bitcoins, which people are taking as the same thing as silver and gold, because silver is worth less than gold... it makes no sense. Rocks are worth less than gold too, but they are not connected to gold in any way in form of trading.
