There's one issue that can be interesting, this is how FX participants or stock market players can switch their interest to BTC. The market is small enough to be manipulated, and mature enough to allow profits. Pumps and dumps aren't a novelty in the altcoin markets, they happen on stock markets on a day to day basis, but I'd be skeptical to say that FX players are joining the Bitcoin or altcoin market.

With regard to naked speculation, I used to talk to a director at one of the Forex brokerage companies, he was an experienced stock market investor. While investing, he used to observe pumps and dumps day after day at our Polish stock exchange (GPW), which is a relatively small exchange. The director kept a journal of stocks that were pumped and then dumped. Each day or within a few days, new stock, increase the value, grab some suckers, and then dump, then another one. He observed it for one year. I was quite surprised to learn about that, so I asked if there was a method to profit from such observations. The point is that it becomes visible only at the dump moment:) so there's no way to judge if those are speculators trying to suck others in, or is it a price increase that has some fundamentals behind it.

Here's a less skeptical bit about the FX players.

http://www.forexfactory.com/showthread.php?p=7681402#post7681402