IMO the hope for Ogryns is 6th edition. GW have made the fantasy and 40k games more similar. The new Chaos SM codex is great and expands the scope of units. They have made the 40k soul grinder model usable in WFB. I think I see a general move to cross-fertilise between 40k and WFB.

It is possible that they might see the sense in allowing WH40K players to field Ogre models - perhaps with a 40k conversion kit… These might be designated 'Feral Ogryn Allies'.

Imagine taking a Ogryn Ninja Maneater onto the field! They would have my money. If GW did this with the new IG codex, we would see the FFG version soon after.

Fresnel said:

A couple of years ago there was a white dwarf article about potential breeds of abhumans which could be used in an imperial guard regiment and one of the units listed were feral world ogryns which were supposed to be so backward in terms of their understanding and use of technology that they couldn't be trained to use ripper guns so technically your 'feral ogryn allies' already exist. 

Yes, except that if you showed a ripper gun to WFB Ogre, he would want to dual wield them and have a bunch of spares. In fact, if you showed him lascannons, he would figure out a way to adapt the grip and trigger - he would want to dual wield them to. A creature so stupid it cannot be taught to pull a trigger and which end to point, is far from this.

Fresnel said:

Arguably the IG only recruits the particularly stupid/easily indoctrinated Ogryns from their homeworlds.  Your average Ogryn on their home worlds might indeed be of Warhammer Fantasy Ogre intelligence.

Ymmv but I don't find either the brain-poisoning or the moron-selection ideas very plausible and there is no fluff-support for either.

Currently WH40K has Ogryns in a comic-relief 'Dumb as Rocks' role. Obviously a GM can change that in his game - but some players will not like this.

As I said, I think the only hope is that GW see a marketing opportunity in opening up Ogre Kingdoms models to WH40K armies (with conversion kits too). This would require a canon shift - which GW would do if they saw money in it. As a player of the TT WH40K game, I can imagine expanding the IG range for Ogryns and even a Feral Ogyrn ally list as a concept that has potential. 

N.B. Ogre Kingdoms still has Ogres as comic of course - just in more than a 'one-note' way.

For the OP, I didn't noticed it, but a Ratling crew could also give a bonus to the acquisition roll when you'Re at a space station; all the black market going and leaving, surely the word got around that good ol' Captain X's the leader of the runts who brought up all those nice illigal things (or others) all sneaky like into port.

As for Only War, Weapon sepcialist with the sniper rifle as the regimental basic weapon.  Use your comrade's skill, especially the "your attack counts as pining" one.  Everyone passed on that one.