So, they finally figured it out. Now, it doesn't matter which blood type you are, it can be converted to type O. This means, every time you go to the hospital, you can either get synthetic blood, or type O human blood.. interesting choices we get nowadays.
It seems that this is the original article that describes the process which is being reported all over the web, but it seems that here is the abstract, and this is a reliable resource for this news.
this is the original text of the abstract from Nature:
Enzymatic removal of blood group ABO antigens to develop universal red blood cells (RBCs) was a pioneering vision originally proposed more than 25 years ago. Although the feasibility of this approach was demonstrated in clinical trials for group B RBCs, a major obstacle in translating this technology to clinical practice has been the lack of efficient glycosidase enzymes. Here we report two bacterial glycosidase gene families that provide enzymes capable of efficient removal of A and B antigens at neutral pH with low consumption of recombinant enzymes. The crystal structure of a member of the 
-N-acetylgalactosaminidase family reveals an unusual catalytic mechanism involving NAD+. The enzymatic conversion processes we describe hold promise for achieving the goal of producing universal RBCs, which would improve the blood supply while enhancing the safety of clinical transfusions.