I wanted to avoid speculation, but my earlier guess was that the results will be definitely negative for classic XMRV (no surprise there), and probably an overall negative for HGRV in ME/CFS, but something interesting has still been found, perhaps an important clue to the issue of contamination or even a (retroviral) lead for a small minority of patients. If the results are generally negative, there may still be an emphasis on the progress of other projects currently underway or in planning. We will know soon anyway.
I think the existence of a press conference is no indicator of the nature of the results, and would exist regardless when considering the profile of this study and how the people involved seem to be fully aware that the ME/CFS community wants to be adequately informed about the results. Although it has been said that no single study can be "definitive", the reality is that the results of this study will heavily determine future funding and investigation in this particular area. I have no problem with people combing over the results to find flaws, but I will move on and continue to focus on other areas of the literature if there is no evidence found for a retrovirus in ME/CFS.
However, for the first time I feel a slight sense of cautious optimism in the horizon for ME/CFS. Obviously the situation is still appalling and events are unravelling too slowly, but it does seem that our situation is showing signs of gradually changing for the better. In the last few years there have been a boost of interest from reputable scientists and there are multiple interesting studies underway. The PACE Trial has further exposed the barely concealed failures of the cognitive behavioural model for ME/CFS and helped to shift the focus of the MRC in the UK towards a more biomedical approach after years of stubbornness. There will be resistance from biopsychosocialists but sooner or later our time will come.