This dumps don't seem to be related with news, or bitcoin development. They actually look like coordinated sell outs to crash the market and cause some panic. Some say it's Mt Gox sell out, maybe it is, maybe it's not. It's hard to tell, but they don't look natural, so they should be over eventually. Or maybe it's from rich people that don't believe in bitcoin, or that just have so much coins, that they simply want to sell out a few, without completely destroying the market, so they do these sell outs in a timed way.
Either way there is a lot of selling pressure right now, and it's hard for the market to follow the good news that we are getting in terms of bitcoin development and adoption.
I would say don't worry about it. The sell out sill eventually stop, and since LN is near, and adoption should probably happen in the future, the markets will eventually resume a very positive trend.