Hi, The way the American said it is fine because he is saying he 'will be' which sounds definite. However your version is also acceptable but the word 'would' sound less definite then 'will'. This probably is not much help but it is the best way I could think of to explain.
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NotoriozIf he wrote 'want' instead of 'wanted' I would use 'will be joining'."I wanted to tell you that I will be..." is OK if, as I said, the act of joining is still in the future.
JmnumberHi,The way the American said it is fine because he is saying he 'will be' which sounds definite. However your version is also acceptable but the word 'would' sound less definite then 'will'.No. Both 'would' and 'will suggest the same degree of certainty in this context.
GPY