Yes, ANC is now on 787 seasonally.....and many of the pilots on the 787 are very happy about it.
As the 767/757 fleet goes offline and more 787’s come online, don’t be surprised to see the 787-8, especially, taking over the route the 767/757 flew domestically.
If anyone recalls, Boeing had a brochure right as the 787 was coming out, before the first ANA delivery. In it, they advertised the -8 as a 757 replacement, the -9 as 767 replacement, and the -10 as a “possible” 777-200 replacement. Now that AA is getting so many, except the -10, don’t be surprised to see them do exactly what the brochure advertised. As a far as replacing the 777, I think Boeing was focusing on passenger loads and not cargo. The 787 cannot replicate the 777 when cargo is involved.