I can't give an intelligent answer, but the volume is not just today. For the past few weeks volume has been very high. It broke 2 million units a day at the end of the week before last (the 24th and 25th) and again last Friday and yesterday. Today looks like another high volume day as well.
And the price jumps all over the place so it's impossible for me to conclude that it's buying pressure. Some days, it's closing near the high and other days, near the low. I can't see any daily trend, but the overall trend is up. My problem is that I don't know if I'm being given another opportunity to buy in cheaply before earnings and guidance or if the smarter people are selling.
I seem to recall another poster on this board talking about the price being manipulated. Normally I don't pay attention to posts like that but this particular poster seemed to know a lot about the business. Or at least that's how I remember it. In the meantime, I'm still buying a bit.