The Wall Street coming to the bitcoin, that could be the reason for the recent price rise. The volume in Bitstamp is also higher.
No. The current price rise has only to do with the nearing block halving.
It's not new that Wall Street has a certain interest in Bitcoin or the Blockchain, or even in both. It's just a matter of waiting till they really go from saying it, to taking action to incorporate Bitcoin and make it tradable just like how you buy stocks. That would be a massive achievement and will make Bitcoin go sky high. The institutional traders will then be more willing to trade in Bitcoin instead of using "The Nasdaq Of Bitcoin" Gemini.