Just out of interest, is there a current 'year' or span of years in which the 40kverse is set in? I know GW likes to remain staic with their fluff, and not advance anywhere ,but does anyone have an idea what sort of timeline the latest fiction/campaigns are set, and if so, whether this means that 40k is technically 'up to' that year/years? The latest I can recall was Usarkar Creed, where the IG codex describes the 13th crusade beginning around 999.M41.
I know this might all sound confusing, but it just seems like GW lets everything drift around somewhere between M.31 and M.41, with no regards as to where we are up to.