Easy to miss: "The recent human trials involved 30 healthy volunteers, where 24 were treated with MVA-B, while the other 6 were treated with a placebo, carried out over a 48 week period." This test was done on healthy volunteers, not ones with HIV. Although it's promising that 90% of the patients showed an immune response, we don't know how well that immune response translates into therapeutic benefit until it's tria…
Once that is done, how well it works is the Phase 2. See here: http://en.wikipedia.org/wiki/Clinical_trial#Phases