Usually when something is out of stock it shows up with a button that says something like "Tell me when its available".
There's just no entry at all.
Holofields are NOT better in the harlequin codex. They're worse by a country mile. Bladestorm for the most part is inconsequential to me. We could lose it tomorrow and I would be not that sad. What they're going to do is make battle focus a power you only get when you take a certain formation combo. Farseers ML2, Warlocks brotherhood of psykers, warp spiders back to jump troops, and holofields getting the aforementioned nerf stick (I wish they'd work like titan holofields). No changes to falcons, banshees, scorpions or wraith constructs.And if the Harlequins are any indication, Bladestorm should stay the same for alle Weapons while Holofields get better.