User blog comment:JustJuuno/Got Back From The Transplant, But Not Fully Recovered Yet + 1.1.0 & 1.12 News/@comment-28272355-20170209060859

Since Jeb decided to leak a Concrete Block info about 1.1 for PE, it is safe to assume that Concrete blocks are confirmed in 1.1, but Terracotta blocks will still be uncomfirmed to be added in PE.