Should I join bioengineering (dual degree) at IIT Mandi, although it's introduced only this year?

If you are interested in the field of bioengineering, then you can consider taking a dual degree at IIT Mandi. But there are some limitations since it is a newly introduced branch here. 

1. First of all, you should clearly go through the course curriculum offered at Mandi and figure out whether the offered subjects are your cup of tea or not.
2. You try to connect with the faculty to get a wider perspective on this course, which was introduced recently. 

If you are looking for a branch change, then you can blindly opt for this institution. IIT Mandi is the best institute to take advantage of branch change criteria.