For the first time in 138 days, Robin Roberts got up at 4 a.m. this morning and appeared on Good Morning America not only to greet us with a "Good Morning America" but, more importantly, to let us and her co-hosts know that she'll be starting her comeback in earnest back at the GMA studios next week, with a dry run of the show. Here she is:

That's great news. Roberts announced last June that she had been battling a blood disease called myelodysplastic syndrome, or MDS, which is reportedly a complication from the breast cancer treatments she received in 2007. She left the show on August 30 to receive a bone marrow transplant and undergo chemotherapy to treat the disease.  

Roberts says her last bone marrow test "showed no abnormalities" and that she and her sister (her donor) are doing well. Roberts tweeted:

According to Roberts, we should see her back on GMA sometime in February, and she will start "dry runs" of the show to see how her body reacts to the early and often workload.