Check it:
http://www.coindesk.com/price/Earlier today, Bitcoin was at $289, and look at this now.
What do you think is the cause?
When will this uptrend end?
I think the cause is increased usage, coinbase being a regulated exchange and the ETF, if anything the rise has been far less than I expected.
I think the uptrend will continue up to $500 or so, it will be a slow rise though, no $100 rise days like in the last bubble.
I'm thinking Coinbase is having a lot to do with it. The US hasn't really had anyway to purchase BTC directly with a reputable company. Many, including myself, wouldn't even think about wiring large amounts of USD to an anonymous exchange somewhere across the pond. Sure some did IE.. mostly the ones that got Gox'd.