According to esctoday.com, Czech national broadcaster CT has affirmed to them that Czech Republic will take part in Stockholm, Eurovision 2016.

The fifteen countries are known up to present that confirmed their participation for next year, now 16th country is clear.
After being absent from the Eurovision Song Contest the last 5 years, Czech Republic was making their return in last year. They chose┬áMarta Jandov├í and V├íclav Noid B├írta by internal selection to go Vienna. For the their first time, the song’s language was in English, and many fans interpreted like that it was an advantage to qualify first-time.

But the Czech artists could not┬áachieve it,┬áunfortunately with their very strong ballad song “Hope Never Dies”

Source: esctoday.com