Hmm, obviously way to early to draw any conclusions, but this post from someone who claims to already have Escalation makes it sound like it suffers from a bit of "Inquisition-itis":
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Anyway, have had a flick through Escalation and I was frankly disappointed. As far as I can tell it's a cut-and-paste of the rules for Superheavies, Gargantuan Creatures, D Weapons and the 'Big Template Weapons' rules, straight from the Apocalypse rulebook, with a £30 price sticker slapped on.
There were copies of the data sheets for all Baneblade variants, Thunderhawks, Stompas, Lord Of Skulls, Harridan, Tessaract Vault, Obelisk, Transcendant C'tan, Tau Flying thing (Didn't get a good look at this one) and the Eldar (and Dark Eldar, apparently...) Revenant Titan. I don't recognise the Tau flyer from the Apocalypse book, but all of the others are cut-and-paste from Apocalypse.
There were two new missions and that seems to be about it.
K.
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