So you want a Wraithknight/Riptide sized model, but you play Orks? "Problem" solved.
That's what allies / unbound are for.
eh, when you are throwing 100 boyz on the table, it is not the easiest thing to have to deploy another model 12 inches away and keep it away the whole game. Not that I have a problem Ork-ying up a Riptide, et al.
And I still do not like the idea of "oh, your army isn't very good, well just throw some allies in". I play Orks to play Orks.
I personally do not want a Wraithknight/Riptide (we already have MegaDreads) sized model unless it adds something new to the faction. The new dex is not out yet, so I will reserve judgement, but as it stands right now, I am not really impressed.
An Orked up Knight (which is basically what I originally hoped the Pregnant Deff Dread was going to be) which have added something sorely needed to Orks. Ranged AT and still been really good in melee.