The news is quite fresh, so there's very little to go by at this point. None of the two companies are available for comment at this point according to the WSJ. Oracle claims that Android infringes upon 7 different Java patents.
"In developing Android, Google knowingly, directly and repeatedly infringed Oracle's Java-related intellectual property," Oracle spokesperson Karen Tillman said in a statement.
Clearly a developing story. Isn't Java like, you know, open source under the GPL?