take-over taget

There must be a HC reader who understands take-overs. It would be very nice to see very informed comment.

For a stock that is supposed to increase sp by around 50% with great possibility to be much more, who would be interested? Daiichi-Sanko might be a possibility, given that last year they purchased a private biotech company for around A$300 million.

Would the money be on GSK, Roche or DS? Are there others who might be interested?

In Australia, take-over offers seem to be initially at a 20% premium to last trade. Would this be likely for a volatile stock like BTA?