That's hardly either a course of conduct or necessarily the same thing. The End Times (5 Books) were source books charting the End of the Warhammer World not Warhammer Armies Books and they made it fairly obvious. We're talking about a Codex and a supplement also it's 40K not WFB also. Oh gad they provided a complete set of free rules to replace them, which they have done every time a large scale overhaul has occurred.
Why is it that the exception must be considered the rule, it's a bit like when everyone keeps bumping their gums about armies being "Squated" like it's something that happens all the time when in fact it happened once ,to squats, 20 odd years ago.
Going off topic here I'm more interested to hear what form people think this supplement may take the existing Chaos ones have been fairly lightweight as far a changes went but we're going to be looking at rules for 8 different factions in one book. Also do we think this is going to signal a moving of SoB to a support faction sort of roll, it also says Grey Knights are going to be included in Imperial Agents I'd very much doubt that it'll mean their Codex is removed