Ok, before you all get excited and make up all sorts of cool stories, better to go to the source and figure out what is going on.
First of all, the following is the only place where you hear the real story: http://www.oracle.com/sun/sun-faq.pdf
To save you time, this is the statement on Oracle Exadata taken directly and verbatim (!!) from the FAQ linked above:
Q: What impact does this announcement have on the HP Oracle Exadata Storage Server and HP Oracle Database Machine products?
A: There is no impact. Oracle remains fully committed to the HP Oracle Exadata Storage Server and HP Oracle Database Machine products.
That's all folks.