Kit question: Can the standard issue Camelbak be attached directly to the new style Osprey body armour or does it need a pouch? Similarly, has anyone found a good method of attaching the Camelbak directly to the PLCE yoke to avoid the faff of having two sets of straps?
Yes it can.
As for attatching a pack to a yoke, the simplest way would be to stitch on 4 QR buckles, but seeing as how you would end up with loose shoulder straps flapping around, why not just use them or tuck it into the top of your daysack or bergen?
Correct - the Osprey Assault comes with a fitting kit that includes add on securing clips (top and bottom) as well as loops for securing the Camelback's D-Rings to the body armour's cover to hold the Camelback close to the armour, prevent sagging etc.
Bit off topic, but talking about Opsrey, I saw a photo from Afghan today with guys from the Royal Welsh. Some had the new Opsrey assault but 1 guy had what looked liked the original osprey but with clips and straps (not the molle stuff) on the sides. Is that a personal mod or an improved design to stop it flapping open when you go prone?