I'm with Ozzie and Peachey on this one. There's nothing uniquely American about the 'll' contraction. Unless anyone's confusing it with the Southern 'y'all', that is - but that's a whole different kettle of fish.
All native speakers use the 'll' contraction of 'will' in speech, whatever the subject happens to be and providing it's anything like pronounceable. So, apart from a difference in the voicing of the initial 'th' sound, 'this'll' actually sounds very like the spiky plant called the 'thistle' .
What we don't tend to do, though, is write down forms like 'this'll'. We would write the full form ( this will ) even though we might read it as 'this'll'. The only contracted forms we usually write are the standard pronoun+auxiliary contractions - I'll, you'll and so on.
So, after a full day's answers, and replies from all over the world, there's your answer, Hoon. Yes, you are right.