How strong is he?
"http://www.marvel.com/universe3zx/images/1/16/Hulkling_head.jpg He shape shifted himself some muscles. Just like when he shape shifts wings and they actually let him fly, when he gives himself more muscles, they actually make him stronger."Well how much stronger do they make him and how big can he make himself?
If he only got his strength from his kree side then as an average Kree can lift approx 1000 lbs, it's not much in the way of superstrength. However, maybe his twin race nature provides him with some mutant characteristics?
Anyway, it does seem clear that his shapeshifting is not just cosmetic but does confer additional powers - this is not a new idea, other Marvel characters have displayed the same range of powers (for example the skrull girl that appeared in Guardians of the Galaxy). As to how strong Hulkling can get when he 'bulks' up - he has had an entry (I think) in some of the new Handbooks with the power scales - so this might give us a hint.
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