Don't know about why, but I certainly can't see a link for them on the main page. but if you look here then you can see the range.
Well rumour is they are the pre 6th loyalist book, but i don't quite remember this years shedual since until 6th box set or chaos i don't give a rut...
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I don't think it is anything more than placing them as a sub-category because they are a sub-codex. The 'evil-empirists' will continue to tout their conspiracies, but I don't buy any sort of "they are doing this to RUIN the game".
That said, it has been floating for a while that the Dark Angels are due some lovin', and the WD binding thing points towards something happening. Who knows? :)
Really hoping they are gonna get some love around the time of the upcoming Chaos rework. A Chaos-DA starter set would be ace, Demonside and I are licking our chops hoping that happens so we can split it.